(Aza)pyridopyrazolopyrimidinones and indazolopyrimidinones and their use

ABSTRACT

The present application relates to novel substituted (aza)pyridopyrazolopyrimidinones and indazolopyrimidinones, to processes for their preparation, the compounds for use alone or in combinations in a method for the treatment and/or prophylaxis of diseases, in particular for the treatment and/or prophylaxis of acute and recurrent bleeding in patients with or without underlying hereditary or acquired bleeding disorders, wherein the bleeding is associated with a disease or medical intervention selected from the group consisting of menorrhagia, postpartum hemorrhage, hemorrhagic shock, trauma, surgery, transplantation, stroke, liver diseases, hereditary angioedema, nosebleed, and synovitis and cartilage damage following hemarthrosis.

RELATED APPLICATIONS

This application is a continuation of, and claims priority to, U.S.patent application Ser. No. 14/533,915, filed Nov. 5, 2014, the contentsof which are incorporated herein by reference in their entirety.

The present application relates to novel substituted(aza)pyridopyrazolopyrimidinones and indazolopyrimidinones, to processesfor their preparation, the compounds for use alone or in combinations ina method for the treatment and/or prophylaxis of diseases, in particularfor the treatment and/or prophylaxis of acute and recurrent bleeding inpatients with or without underlying hereditary or acquired bleedingdisorders. The present invention also relates to medicaments comprisingthe compounds according to the invention for the treatment and/orprophylaxis of acute and recurrent bleeding in patients with or withoutunderlying hereditary or acquired bleeding disorders, wherein thebleeding is associated with a disease or medical intervention selectedfrom the group consisting of menorrhagia, postpartum hemorrhage,hemorrhagic shock, trauma, surgery, transplantation, stroke, liverdiseases, hereditary angioedema, nosebleed, and synovitis and cartilagedamage following hemarthrosis.

Bleeding is the common clinical hallmark in hereditary and acquiredbleeding disorders, trauma, surgery, stroke, menorrhagia (also termedheavy menstrual bleeding, HMB), postpartum hemorrhage, and liverdiseases. When tissue is damaged, vessels can rupture, immediatelytriggering the hemostatic mechanism, resulting in a stable fibrinnetwork. The fibrinolytic system is activated by the deposition offibrin and assists in the maintenance of an open lumen in damaged bloodvessels. A balance between the formation and lysis of fibrin is requiredto maintain and remold the hemostatic seal during several days in whichthe injured vessel wall is repaired.

Fibrinolysis is the physiological mechanism that dissolves clots. Thefibrinolytic system comprises plasminogen, the circulating inactiveprecursor of plasmin, a potent serine protease involved in thedissolution of fibrin blood clots. Tissue-type plasminogen activator(tPA) and urokinase-type plasminogen activator (uPA) are the two majorplasminogen activators expressed in many cell types and tissues (Levi JH, Lancet 2010, 376, 9734, 3-4). Plasminogen binds to lysine residues onthe surface of fibrin and is converted to plasmin by an activatorreleased from endothelial cells—tPA—that simultaneously binds to fibrin.As part of the hemostatic balance, plasmin generation and activity arealso modulated by multiple inhibitors that include plasminogen activatorinhibitor (PAI-1), thrombin-activatable fibrinolysis inhibitor (TAFI)and α₂-antiplasmin (Cesarman-Maus G, Hajjar K A, Br J Haematol 2005;129: 307-21).

Activators of fibrinolysis can be therapeutically used to dissolve bloodclots in thrombotic conditions like myocardial infarction or ischemicstroke, to avoid degradation of the surrounding tissue (Flemming M,Melzig M F, J Pharm Pharmacol. 2012, 64(8):1025-39). On the other handinhibition of fibrinolysis can be, and is successfully and safely usedin the management of bleeding. After extensive tissue injury that occurswith trauma or surgery, the equilibrium is shifted and fibrinolysis isconsidered to be an important contributor to bleeding and coagulopathy.In surgical patients, many studies reported the use of antifibrinolyticagents to decrease bleeding and need for allogeneic transfusions. Themost commonly used are the lysine analogues, ε-aminocaproic acid andtranexamic acid that interfere with the binding of plasminogen tofibrin, which are necessary for activating plasmin (Levi J H, Lancet2010, 376, 9734, 3-4).

Antifibrinolytics are a safe and effective proven concept for reducingblood loss and rebleeding, without increased risk for thrombotic events,for example in the management of bleeding disorders like hemophilia andvon Willebrand's disease, in menorrhagia (heavy menstrual bleeding, HMB)and in different surgical conditions.

Bleeding due to platelet disorders/dysfunctions like Glantzmann'sthrombasthenia and thrombocytopenia as well as anticoagulant-inducedbleeding and PAI-1 deficiency might be potential areas of use. Patientswith acute promyelocytic leukaemia who frequently develop severebleeding might also benefit from antifibrinolytics therapy. In addition,it has been suggested that blocking fibrinolysis could potentially beuseful to block plasmin-induced proteolysis which may be of biologicalrelevance during athero-thrombosis and inflammatory states, cancer andother diseases.

Further, it has been described that antiplasmin may be used for treatingsynovitis and cartilage damage following hemarthrosis in patients withunderlying bleeding disorders including hemophilia and von Willebrand'sdisease (L. Nieuwenhuizen L, Roosendaal G, Masterbergen S C, CoeleveldK, Biesma D H, Lafeber F P J G, and Schuthens, R E G, J Thrombosis andHaemostasis 2013, 12: 237-245).

A further potential area of use of antifibrinolytics is the treatment ofnosebleed caused by trauma and other causes, also coupled withunderlying bleeding disorders including hemophilia and von Willebrand'sdisease.

Antifibrinolytics have also been successfully applied to the treatmentof hereditary angioedema, where a reduction in the number and severityof attacks of edema in patients treated with tranexamic acid could bedemonstrated (Dunn C J, Goa K L, Drugs 1999, 57(6): 1005-1032).

Abnormal uterine bleeding (AUB) may be diagnosed when a womanexperiences a change in her menstrual blood loss (MBL), or the degree ofMBL or vaginal bleeding pattern differs from that experienced by theage-matched general female population (National Collaborating Centre forWomen's and Children's Health (NCCWCH): National Institute for ClinicalExcellence (NICE) guidelines. CG44 Heavy Menstrual Bleeding: fullguideline. 24 Jan. 2007). Normal menstruation occurs at a cycle of 28±7days, lasting 4±2 days with a mean MBL of 40±20 mL. AUB presents aspectrum of abnormal menstrual bleeding patterns that includesirregular, heavy or prolonged menstrual bleeding or an altered bleedingpattern. AUB may be associated with ovulatory or anovulatory cycles.Terms in use are dysfunctional uterine bleeding (DUB), menorrhagia(abnormally heavy menstrual bleeding at regular intervals which may alsobe prolonged), metrorrhagia (uterine bleeding at irregular intervals,particularly between the expected menstrual periods), andmetromenorrhagia (combination of both).

AUB is one of the most frequent gynecological disorders observed bygeneral practitioners and gynecologists. AUB is an exclusion diagnosis;an organic cause should always be ruled out. Organic causes of AUBinclude benign uterine neoplasia, especially cervical and endometrialpolyps and myoma's, adenomyosis, and malignancies of the cervix andendometrium.

Menorrhagia (heavy menstrual bleeding, HMB) is widely defined in themedical literature as blood loss (MBL) of 80 mL or more per menstrualperiod (Hallberg L, Nilsson L. Determination of menstrual blood loss.Scandinav J Clin Lab Invest 1964; 16:244-8, Hallberg L, Hogdahl A M,Nilsson L, Rybo G. Menstrual blood loss—a population study. Variation atdifferent ages and attempts to define normality. Acta Obstet GynecolScand 1966; 45(3): 320-51, O'Flynn N, Britten N. Menorrhagia in generalpractice—disease or illness. Soc Sci Med 2000; 50(5): 651-61). Withinthe meaning of the present invention, menorrhagia is defined asmenstrual blood loss of 60 ml or more per cycle, for example 60 to 80 mlper cycle, in particular more than 80 ml per cycle. According to NICE,menorrhagia should be defined for clinical purposes as excessivemenstrual blood loss which interferes with the woman's physical,emotional, social and material quality of life, and which can occuralone or in combination with other symptoms. Any interventions shouldaim to improve quality of life measures. The global prevalence rate ofmenorrhagia, based on 18 epidemiological studies, ranges from 4% to 52%(Fraser I S, Langham S, Uhl-Hochgraeber K. Health-related quality oflife and economic burden of abnormal uterine bleeding. Expert Rev ObstetGynecol 2009; 4(2): 179-89). The wide variation can be accounted for bydifferent methods of assessment and population samples used by eachstudy. Prevalence rates in studies that use subjective assessments havebeen found to be consistently higher, compared to 9-11% in studies thatdirectly measured MBL. However an estimated 30% of women suffering frommenorrhagia appears to be more representative (Hurskainen R, Grenman S,Komi I, Kujansuu E, Luoto R, Orrainen M, et al. Diagnosis and treatmentof menorrhagia. Acta Obstet Gynecol Scand 2007; 86(6): 749-57,El-Hemaidi I, Gharaibeh A, Shehata H. Menorrhagia and bleedingdisorders. Curr Opin Obstet Gynecol 2007; 19(6): 513-20). Menorrhagia ismore prevalent among women at the extreme ends of the reproductive agespectrum (i.e., adolescent girls and women approaching or going throughmenopause) (Shapley M, Jordan K, Croft P R. An epidemiological survey ofsymptoms of menstrual loss in the community. Br J Gen Pract 2004;54(502): 359-63).

Underlying bleeding disorders, for example hereditary or acquiredbleeding disorders, such as hemophilia and von Willebrand's disease,platelet disorders/dysfunctions like Glantzmann's thrombasthenia andthrombocytopenia as well as PAI-1 deficiency, are potential causes ofheavy menstrual bleeding. Menstruation and ovulation are uniquehemostatic challenges that occur monthly in women of reproductive age.Integral hemostatic systems are required to control excessive bleedingduring these events. While men with mild hereditary bleeding disordersare often asymptomatic, women suffer a significant morbidity andimpaired quality of life mainly with menstrual-related bleedings.Menorrhagia is often the presenting symptom of an underlying bleedingdisorder and can be the only bleeding symptom in women. Menorrhagia wasrecognized as a valuable predictor for diagnosis of bleeding disorders.A prospective study of 150 women presenting with menorrhagia found thefrequency of undiagnosed bleeding disorders of 17% and von Willebrand'sdisease was the most common with an incidence of 13%. Subsequently, asystematic review of literature confirmed an overall incidence of 13%(95% CI 11%, 15.6%) of von Willebrand's disease among 988 women in 11studies. Mild platelet function defects are also a frequently foundhereditary bleeding disorder in women with menorrhagia. However,disorders of platelet function are more likely to remain undiagnosed dueto the complex and specialized testing that requires fresh specimens.There are only a few studies in the literature that assess the incidenceof platelet function disorders in women with menorrhagia. These studiesreported platelet function defects to be more common than vonWillebrand's disease and were found in approximately 50% of womenpresenting with menorrhagia. Thus, the association of menorrhagia inwomen and hereditary bleeding disorders is well established (Kadir R A,Davies J. Hemostatic disorders in women. J Thromb Haemost 2013, 11(Suppl. 1): 170-9).

Tranexamic acid is approved for the treatment of menorrhagia and avariety of surgical hemorrhagic conditions. Very high, multiple doses oftranexamic acid are required and the most commonly reported drug-relatedadverse events after oral administration are gastrointestinal, likenausea, vomiting, diarrhea and dyspepsia (Wellington K, Wagstaff A J,Drugs 2003, 63 (13): 1417-1433), (Dunn C J, Goa K L, Drugs 1999, 57(6):1005-1032). WO 2006/023000 A1 pertains to modified release oraltranexamic acid formulations and methods of treatment herewith.

WO 2010/117323 A1 and WO 2012/047156 A1 pertain to isoxazol-3(2H)-oneanalogs as plasminogen inhibitors and their use in the treatment offibrinolysis related diseases, including hereditary bleeding disorders,stroke, menorrhagia and liver diseases. The compounds described in WO2010/117323 A1 and WO 2012/047156 A1 are structurally unrelated to thecompounds of the present invention.

WO 2012/080237 pertains to substituted pyrimido[1,2-B]indazoles andtheir use as modulators of the PI3K/AKT pathway for the treatment ofcancer. The compounds of formula (I-A) or (I-B) according to the presentinvention are structurally distinct from the compounds of formula (I) ofWO 2012/080237.

It was an object of the present invention to provide novel substanceswhich act as inhibitors of fibrinolysis and, as such, are suitable forthe treatment and/or prophylaxis of diseases.

The present invention provides compounds of the general formula (I-A)

in which

-   R¹ is selected from hydrogen and C₁-C₄ alkyl;-   X¹ is selected from nitrogen and C—R²;-   X² is selected from nitrogen and C—R³;-   X³ is selected from nitrogen and C—R⁴;-   X⁴ is selected from nitrogen and C—R⁵;-   with the proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    -   hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₁-C₄ haloalkyl,        C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, cyano, amino, nitro, mono- or        dialkylamino, hydroxy, thiol, carboxyl, C₃-C₇ cycloalkyl, 5 to 6        membered heteroaryl, the 5 to 6 membered heteroaryl being        optionally substituted with one, two, or three substituents        selected from C₁-C₄ alkyl, and phenyl, the phenyl being        optionally substituted with one, two, or three substituents        selected from halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄        alkoxy, and C₁-C₄ haloalkoxy, or    -   a group of a formula selected from —CO—NR⁷R⁸, —NH—CO—R⁹,        —CO—O—R⁹, —CO—R⁹, —SO₂R¹⁰, —SO₂NR¹¹R¹², —SR¹⁰, CH₂CN,        —CH₂NR¹¹R¹², —CH₂OR¹⁰, wherein        -   R⁷ and R⁸ independently from each other represent hydrogen,            C₁-C₄ alkyl, C₆ aryl, and 5-6 membered heteroaryl;        -   R⁹ represents C₁-C₄ alkyl, C₆ aryl, and 5-6 membered            heteroaryl;        -   R¹⁰ represents C₁-C₄ alkyl;        -   R¹¹ and R¹² independently from each other represent            hydrogen, and C₁-C₄ alkyl;-   with the proviso that zero, one, two, or three of R² to R⁵ are    different from hydrogen,-   and salts, solvates, and solvates of the salts.

The present invention provides compounds of the general formula (I-B)

in which R¹, X¹, X², X³, and X⁴ are as defined above,

-   and salts, solvates, and solvates of the salts.

Compounds according to the invention are the compounds of the formulae(I-A) or (I-B) and their salts, solvates and solvates of the salts, thecompounds included in the formulae (I-A) or (I-B) of the formulaementioned in the following and their salts, solvates and solvates of thesalts, and the compounds included in the formulae (I-A) or (I-B) andmentioned in the following as embodiment examples and their salts,solvates and solvates of the salts, where the compounds included in theformulae (I-A) or (I-B) and mentioned in the following are not alreadysalts, solvates and solvates of the salts.

Within the meaning of the present invention, the term “x acid” in any ofthe formulae does not indicate any defined stoichiometric ratio of acidand the respective compound. Thus, depending e.g. on the alkalinity ofthe respective compound, the term “x acid” denotes different ratios ofthe compound to the acid, such as 10:1 to 1:10, 8:1 to 1:8, 7:1 to 1:7,5:1 to 1:5, 4.5:1 to 1:4.5, 4:1 to 1:4, 3.5:1 to 1:3.5, 3:1 to 1:3,2.5:1 to 1:2.5, 2:1 to 1:2, 1.5:1 to 1:1.5, and 1:1.

Preferred salts in the context of the present invention arephysiologically acceptable salts of the compounds of formula (I-A) or(I-B) according to the invention. Salts which are not themselvessuitable for pharmaceutical uses but can be used, for example, forisolation or purification of the compounds of formula (I-A) or (I-B)according to the invention are also included.

Physiologically acceptable salts of the compounds of formula (I-A) or(I-B) according to the invention include acid addition salts of mineralacids, carboxylic acids and sulphonic acids, e.g. salts of hydrochloricacid, hydrobromic acid, sulphuric acid, phosphoric acid,methanesulphonic acid, ethanesulphonic acid, toluenesulphonic acid,benzenesulphonic acid, naphthalenedisulphonic acid, formic acid, aceticacid, trifluoroacetic acid, propionic acid, lactic acid, tartaric acid,malic acid, citric acid, fumaric acid, maleic acid, benzoic acid, oxalicacid, ascorbic acid, and salicylic acid.

Physiologically acceptable salts of the compounds of formula (I-A) or(I-B) according to the invention also include salts of conventionalbases, such as, by way of example and preferably, alkali metal salts(e.g. sodium and potassium salts), alkaline earth metal salts (e.g.calcium and magnesium salts) and ammonium salts derived from ammonia ororganic amines having 1 to 16 carbon atoms, such as, by way of exampleand preferably, ethylamine, diethylamine, triethylamine,ethyldiisopropylamine, monoethanolamine, diethanolamine,triethanolamine, dicyclohexylamine, dimethylaminoethanol, procaine,dibenzylamine, N-methylmorpholine, arginine, lysine, ethylenediamine,and N-methylpiperidine.

According to an embodiment of the invention, physiologically acceptablesalts of the compounds of formula (I-A) or (I-B) according to theinvention include salts of hydrochloric acid, sulphuric acid, maleicacid, acetic acid, trifluoroacetic acid, phosphoric acid, tartaric acid,citric acid, fumaric acid, oxalic acid, ascorbic acid, salicylic acid,and lysine.

According to an embodiment of the invention, physiologically acceptablesalts of the compounds of formula (I-A) or (I-B) according to theinvention include salts of hydrochloric acid, sulphuric acid, maleicacid, acetic acid, trifluoroacetic acid, tartaric acid, ascorbic acid,and salicylic acid.

According to an embodiment of the invention, physiologically acceptablesalts of the compounds of formula (I-A) or (I-B) according to theinvention include salts of hydrochloric acid, and trifluoroacetic acid.

According to an embodiment of the invention, the physiologicallyacceptable salts of the compounds of formula (I-A) or (I-B) according tothe invention are the salts of hydrochloric acid.

An embodiment of the invention is also the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its physiologically acceptable salts as defined above.

An embodiment of the invention is also the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its physiologically acceptable salts selected from thegroup of salts of hydrochloric acid, sulphuric acid, maleic acid, aceticacid, trifluoroacetic acid, phosphoric acid, tartaric acid, citric acid,fumaric acid, oxalic acid, ascorbic acid, salicylic acid, and lysine.

An embodiment of the invention is also the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its physiologically acceptable salts selected from thegroup of salts of hydrochloric acid, sulphuric acid, maleic acid, aceticacid, trifluoroacetic acid, tartaric acid, ascorbic acid, and salicylicacid.

An embodiment of the invention is also the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its physiologically acceptable salts selected from thegroup of salts of hydrochloric acid, and trifluoroacetic acid.

An embodiment of the invention is also the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its maleate that shows the following preferred peakmaximum of the °2 Theta: 9.6, 13.5, 17.4, 22.1, 23.1, 23.7, and 26.7.

An embodiment of the invention is also the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its acetate that shows the following preferred peakmaximum of the °2 Theta: 8.3, 9.1, 12.3, 24.3, 25.0, 26.7, 28.3.

An embodiment of the invention is also the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its sulfate that shows the following preferred peakmaximum of the °2 Theta: 5.6, 10.7, 13.8, 20.3, 20.8, 25.8, 27.6.

An embodiment of the invention is also the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its physiologically acceptable salts as defined above.

An embodiment of the invention is also one or more physiologicallyacceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for the treatment and/or prophylaxis of diseases.

An embodiment of the invention is also one or more physiologicallyacceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for use in a method for the treatment and/or prophylaxis of acuteand recurrent bleeding in patients with or without underlying hereditaryor acquired bleeding disorders.

An embodiment of the invention is also one or more physiologicallyacceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for use in a method for the treatment and/or prophylaxis of acuteand recurrent bleeding in patients with underlying hereditary oracquired bleeding disorders.

An embodiment of the invention is also one or more physiologicallyacceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for use in a method for the treatment and/or prophylaxis of acuteand recurrent bleeding in patients with underlying hereditary oracquired hemostatic disorders.

An embodiment of the invention is also one or more physiologicallyacceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for use in a method for the treatment and/or prophylaxis of acuteand recurrent bleeding in patients with underlying rare bleedingdisorders.

An embodiment of the invention is also one or more physiologicallyacceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for use in a method for the treatment and/or prophylaxis of acuteand recurrent bleeding in patients with or without underlying hereditaryor acquired bleeding disorders, wherein the bleeding is associated witha disease or medical intervention selected from the group consisting ofmenorrhagia, postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, gynaecological surgery, cardiovascular surgery, spinal surgery,liver or lung transplantation, stroke, liver diseases, hereditaryangioedema, nosebleed, and synovitis and cartilage damage followinghemarthrosis.

Within the meaning of this invention, the terms “heavy menstrualbleeding, HMB” and “menorrhagia” are interchangeable.

An embodiment of the invention is also one or more physiologicallyacceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for use in a method for the treatment and/or prophylaxis of acuteand recurrent bleeding in patients with or without underlying hereditaryor acquired bleeding disorders, wherein the bleeding is associated witha disease or medical intervention selected from the group consisting ofheavy menstrual bleeding (HMB), postpartum hemorrhage, hemorrhagicshock, trauma, surgery, otolaryngological surgery, dental surgery,urinary surgery, prostatic surgery, gynaecological surgery,cardiovascular surgery, spinal surgery, liver or lung transplantation,stroke, liver diseases, hereditary angioedema, nosebleed, and synovitisand cartilage damage following hemarthrosis.

An embodiment of the invention is also one or more physiologicallyacceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for use in a method for the treatment and/or prophylaxis of acuteand recurrent bleeding in patients with underlying hereditary oracquired bleeding disorders, wherein the bleeding is associated with adisease or medical intervention selected from the group consisting ofmenorrhagia, postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, gynaecological surgery, cardiovascular surgery, spinal surgery,liver or lung transplantation, stroke, liver diseases, hereditaryangioedema, nosebleed, and synovitis and cartilage damage followinghemarthrosis.

In the context of the present invention, the term “medical intervention”includes medical interventions associated with bleeding, such as surgeryand transplantation. The definition of the term “medical intervention”also includes minor medical interventions that may cause bleeding, suchas tooth extractions, periodontal (gum) surgery, dental implantplacement, biopsies, e.g. dental, prostatic, and urinary biopsies, andthe removal of urinary stones.

An embodiment of the invention is also the use of one or morephysiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for producing a medicament for the treatment and/or prophylaxis ofacute and recurrent bleeding in patients with or without underlyinghereditary or acquired bleeding disorders.

An embodiment of the invention is also the use of one or morephysiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for producing a medicament for the treatment and/or prophylaxis ofacute and recurrent bleeding in patients with underlying hereditary oracquired bleeding disorders.

An embodiment of the invention is also the use of one or morephysiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for producing a medicament for the treatment and/or prophylaxis ofacute and recurrent bleeding in patients with or without underlyinghereditary or acquired bleeding disorders, wherein the bleeding isassociated with a disease or medical intervention selected from thegroup consisting of menorrhagia, postpartum hemorrhage, hemorrhagicshock, trauma, surgery, otolaryngological surgery, dental surgery,urinary surgery, prostatic surgery, gynaecological surgery,cardiovascular surgery, spinal surgery, liver or lung transplantation,stroke, liver diseases, hereditary angioedema, nosebleed, and synovitisand cartilage damage following hemarthrosis.

An embodiment of the invention is also the use of one or morephysiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for producing a medicament for the treatment and/or prophylaxis ofacute and recurrent bleeding in patients with underlying hereditary oracquired bleeding disorders, wherein the bleeding is associated with adisease or medical intervention selected from the group consisting ofmenorrhagia, postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, gynaecological surgery, cardiovascular surgery, spinal surgery,liver or lung transplantation, stroke, liver diseases, hereditaryangioedema, nosebleed, and synovitis and cartilage damage followinghemarthrosis.

An embodiment of the invention is also a medicament comprising one ormore physiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in combination with an inert, non-toxic, pharmaceutically suitableauxiliary.

An embodiment of the invention is also a medicament comprising one ormore physiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in combination with a further active compound selected from thegroup consisting of Factor VIII, Factor IX, Factor VIIa, activatedprothrombin complex concentrates (aPCC) or prothrombin complexconcentrates (PCCs), ε-aminocaproic acid, ethamsylate, paraaminobutylbenzoic acid, tranexamic acid, desmopressin, danazol, combined oralcontraceptive pills (COCPs), progestin intrauterine system,glucocorticoid receptor agonists, analgesics, and nonsteroidalanti-inflammatory drugs (NSAIDs).

An embodiment of the invention is also a medicament comprising one ormore physiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for the treatment and/or prophylaxis of acute and recurrent bleedingin patients with or without underlying hereditary or acquired bleedingdisorders.

An embodiment of the invention is also a medicament comprising one ormore physiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for the treatment and/or prophylaxis of acute and recurrent bleedingin patients with underlying hereditary or acquired bleeding disorders.

An embodiment of the invention is also a medicament comprising one ormore physiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for the treatment and/or prophylaxis of acute and recurrent bleedingin patients with or without underlying hereditary or acquired bleedingdisorders, wherein the bleeding is associated with a disease or medicalintervention selected from the group consisting of menorrhagia,postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, gynaecological surgery, cardiovascular surgery, spinal surgery,liver or lung transplantation, stroke, liver diseases, hereditaryangioedema, nosebleed, and synovitis and cartilage damage followinghemarthrosis.

An embodiment of the invention is also a medicament comprising one ormore physiologically acceptable salts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) for the treatment and/or prophylaxis of acute and recurrent bleedingin patients with underlying hereditary or acquired bleeding disorders,wherein the bleeding is associated with a disease or medicalintervention selected from the group consisting of menorrhagia,postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, gynaecological surgery, cardiovascular surgery, spinal surgery,liver or lung transplantation, stroke, liver diseases, hereditaryangioedema, nosebleed, and synovitis and cartilage damage followinghemarthrosis.

An embodiment of the invention is also a method for the treatment and/orprophylaxis of acute and recurrent bleeding in humans and animals withor without underlying hereditary or acquired bleeding disorders, usingan effective amount of one or more physiologically acceptable salts asdefined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66).

An embodiment of the invention is also a method for the treatment and/orprophylaxis of acute and recurrent bleeding in humans and animals withunderlying hereditary or acquired bleeding disorders, using an effectiveamount of one or more physiologically acceptable salts as defined aboveof the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66).

An embodiment of the invention is also a method for the treatment and/orprophylaxis of acute and recurrent bleeding in humans and animals withor without underlying hereditary or acquired bleeding disorders, whereinthe bleeding is associated with a disease or medical interventionselected from the group consisting of menorrhagia, postpartumhemorrhage, hemorrhagic shock, trauma, surgery, otolaryngologicalsurgery, dental surgery, urinary surgery, prostatic surgery,gynaecological surgery, cardiovascular surgery, spinal surgery, liver orlung transplantation, stroke, liver diseases, hereditary angioedema,nosebleed, and synovitis and cartilage damage following hemarthrosis,using an effective amount of one or more physiologically acceptablesalts as defined above of the compound10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66).

An embodiment of the invention is also a method for the treatment and/orprophylaxis of acute and recurrent bleeding in humans and animals withunderlying hereditary or acquired bleeding disorders, wherein thebleeding is associated with a disease or medical intervention selectedfrom the group consisting of menorrhagia, postpartum hemorrhage,hemorrhagic shock, trauma, surgery, otolaryngological surgery, dentalsurgery, urinary surgery, prostatic surgery, gynaecological surgery,cardiovascular surgery, spinal surgery, liver or lung transplantation,stroke, liver diseases, hereditary angioedema, nosebleed, and synovitisand cartilage damage following hemarthrosis, using an effective amountof one or more physiologically acceptable salts as defined above of thecompound 10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one(example 66).

Solvates in the context of the invention are designated as those formsof the compounds of formula (I-A) or (I-B) according to the inventionwhich form a complex in the solid or liquid state by coordination withsolvent molecules. Hydrates are a specific form of solvates, in whichthe coordination takes place with water. Hydrates are preferred solvatesin the context of the present invention.

The compounds of formula (I-A) or (I-B) according to the invention canexist in different stereoisomeric forms depending on their structure,i.e. in the form of configuration isomers or optionally also asconformation isomers (enantiomers and/or diastereomers, including thosein the case of atropisomers). The present invention therefore includesthe enantiomers and diastereomers and their particular mixtures. Thestereoisomerically uniform constituents can be isolated from suchmixtures of enantiomers and/or diastereomers in a known manner;chromatography processes are preferably used for this, in particularHPLC chromatography on an achiral or chiral phase.

Where the compounds of formula (I-A) or (I-B) according to the inventioncan occur in tautomeric forms, the present invention includes all thetautomeric forms.

Examples of stereoisomeric forms of the compounds of formula (I-A) or(I-B) or (IV) according to the invention are compounds of the formulae(I-A) or (I-B) as defined above, and compounds of the formula (IV) asdefined below, wherein the substituent R¹ has the meaning of C₁-C₄alkyl.

Formula (I-A), wherein the substituent R¹ has the meaning of C₁-C₄alkyl, comprises the following trans-isomers:

Formula (I-A), wherein the substituent R¹ has the meaning of C₁-C₄alkyl, further comprises the following cis-isomers:

Formula (I-B), wherein the substituent R¹ has the meaning of C₁-C₄alkyl, comprises the following trans-isomers:

Formula (I-B), wherein the substituent R¹ has the meaning of C₁-C₄alkyl, further comprises the following cis-isomers:

Formula (IV), wherein the substituent R¹ has the meaning of C₁-C₄ alkyl,comprises the following trans-isomers:

Formula (IV), wherein the substituent R¹ has the meaning of C₁-C₄ alkyl,further comprises the following cis-isomers:

The present invention comprises all possible stereoisomeric forms, alsoin cases where no stereoisomerism is indicated.

According to an embodiment of the invention, the compounds of formulae(I-A), (I-B), and (IV), wherein the substituent R¹ has the meaning ofC₁-C₄ alkyl, are present as mixtures of cis- and trans-isomers.

According to an embodiment of the invention, the compounds of formulae(I-A), (I-B), and (IV), wherein the substituent R¹ has the meaning ofC₁-C₄ alkyl, are present as mixtures of cis- and trans-isomers, whereinmore than 50%, more than 55%, more than 60%, more than 65%, more than70%, more than 75%, more than 80%, more than 85%, more than 90%, morethan 95%, more than 97%, more than 98%, or more than 99%, of thecompounds of formulae (I-A), (I-B), and (IV) are present astrans-isomer.

According to an embodiment of the invention, the compounds of formulae(I-A), (I-B), and (IV), wherein the substituent R¹ has the meaning ofC₁-C₄ alkyl, are present as the enantiomerically pure trans-isomers.

The present invention also encompasses all suitable isotopic variants ofthe compounds of formula (I-A) or (I-B) according to the invention. Anisotopic variant of a compound according to the invention is understoodhere to mean a compound in which at least one atom within the compoundaccording to the invention has been exchanged for another atom of thesame atomic number, but with a different atomic mass than the atomicmass which usually or predominantly occurs in nature. Examples ofisotopes which can be incorporated into a compound according to theinvention are those of hydrogen, carbon, nitrogen, oxygen, phosphorus,sulphur, fluorine, chlorine, bromine and iodine, such as ²H (deuterium),³H (tritium), ¹³C, ¹⁴C, ¹⁵N, ¹⁷O, ¹⁸O, ³²P, ³³P, ³³S, ³⁴S, ³⁵S, ³⁶S,¹⁸F, ³⁶Cl, ⁸²Br, ¹²³I, ¹²⁴I, ¹²⁹I and ¹³¹I. Particular isotopic variantsof a compound according to the invention, especially those in which oneor more radioactive isotopes have been incorporated, may be beneficial,for example, for the examination of the mechanism of action or of theactive compound distribution in the body; due to comparatively easypreparability and detectability, especially compounds labelled with ³Hor ¹⁴C isotopes are suitable for this purpose. In addition, theincorporation of isotopes, for example of deuterium, can lead toparticular therapeutic benefits as a consequence of greater metabolicstability of the compound, for example an extension of the half-life inthe body or a reduction in the active dose required; such modificationsof the compounds of formula (I-A) or (I-B) according to the inventionmay therefore in some cases also constitute a preferred embodiment ofthe present invention. Isotopic variants of the compounds of formula(I-A) or (I-B) according to the invention can be prepared by processesknown to those skilled in the art, for example by the methods describedbelow and the methods described in the working examples, by usingcorresponding isotopic modifications of the particular reagents and/orstarting compounds therein.

The present invention moreover also includes prodrugs of the compoundsof formula (I-A) or (I-B) according to the invention. The term“prodrugs” here designates compounds which themselves can bebiologically active or inactive, but are converted (for examplemetabolically or hydrolytically) into compounds of formula (I-A) or(I-B) according to the invention during their dwell time in the body.

In the context of the present invention, the substituents have thefollowing meaning, unless specified otherwise:

Alkyl in the context of the invention represents a straight-chain orbranched alkyl radical having the number of carbon atoms stated in eachcase. The following may be mentioned by way of example and by way ofpreference: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl,1-methylpropyl, tert-butyl, n-pentyl, isopentyl, 1-ethylpropyl,1-methylbutyl, 2-methylbutyl, 3-methylbutyl, n-hexyl, 1-methylpentyl,2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 3,3-dimethylbutyl,1-ethylbutyl, 2-ethylbutyl.

Haloalkyl in the context of the invention represents an alkyl radical asdefined above being mono- or polyhalogenated up to the maximum possiblenumber of substituents. In the case of polyhalogenation, the halogenatoms can be identical or different. Here, halogen represents fluorine,chlorine, bromine or iodine, in particular fluorine, chlorine orbromine.

Cycloalkyvl or carbocycle in the context of the invention represents amonocyclic saturated alkyl radical having the number of ring carbonatoms stated in each case. The following may be mentioned by way ofexample and by way of preference: cyclopropyl, cyclobutyl, cyclopentyl,cyclohexyl and cycloheptyl.

Alkenyl in the context of the invention represents a straight-chain orbranched alkenyl radical having 2 to 6 carbon atoms and one or twodouble bonds. Preference is given to a straight-chain or branchedalkenyl radical having 2 to 4 carbon atoms and one double bond. Thefollowing may be mentioned by way of example and by way of preference:vinyl, allyl, isopropenyl and n-but-2-en-1-yl.

Alkoxy in the context of the invention represents a straight-chain orbranched alkoxy radical having 1 to 4 carbon atoms. The following may bementioned by way of example and by way of preference: methoxy, ethoxy,n-propoxy, isopropoxy, 1-methylpropoxy, n-butoxy, isobutoxy andtert-butoxy.

Haloalkoxy in the context of the invention represents an alkoxy radicalas defined above being mono- or polyhalogenated up to the maximumpossible number of substituents. In the case of polyhalogenation, thehalogen atoms can be identical or different. Here, halogen representsfluorine, chlorine, bromine or iodine, in particular fluorine, chlorineor bromine.

Alkylamino in the context of the invention includes mono- anddialkylamino and represents an amino group wherein one or two hydrogenatoms are substituted with alkyl radicals.

A 5 to 6-membered Heteroaryl in the context of the invention representsa monocyclic aromatic heterocycle (heteroaromatic) which has a total of5 or 6 ring atoms, which contains up to three identical or differentring heteroatoms from the group consisting of N, O and S and is attachedvia a ring carbon atom or, if appropriate, a ring nitrogen atom. Thefollowing may be mentioned by way of example and by way of preference:furyl, pyrrolyl, thienyl, pyrazolyl, imidazolyl, thiazolyl, oxazolyl,isoxazolyl, iso-thiazolyl, triazolyl, oxadiazolyl, thiadiazolyl,pyridyl, pyrimidinyl, pyridazinyl, pyrazinyl and triazinyl.

Halogen in the context of the invention includes fluorine, chlorine,bromine and iodine. Preference is given to chlorine, bromine, orfluorine.

If radicals in the compounds of formula (I-A) or (I-B) according to theinvention are substituted, the radicals may, unless specified otherwise,be mono- or polysubstituted. In the context of the present invention,all radicals which occur more than once are defined independently of oneanother. Substitution by one, two or three identical or differentsubstituents is preferred.

In the context of the present invention, the term “treatment” or “treat”includes the inhibition, delay, arrest, amelioration, attenuation,limitation, reduction, suppression, reversal or cure of a disease, acondition, a disorder, an injury and a health impairment, of thedevelopment, course or the progression of such states and/or thesymptoms of such states. Here, the term “therapy” is understood to besynonymous with the term “treatment”.

In the context of the present invention, the terms “prevention”,“prophylaxis” or “precaution” are used synonymously and refer to theavoidance or reduction of the risk to get, to contract, to suffer fromor to have a disease, a condition, a disorder, an injury or a healthimpairment, a development or a progression of such states and/or thesymptoms of such states.

The treatment or the prevention of a disease, a condition, a disorder,an injury or a health impairment may take place partially or completely.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and C₁-C₄ alkyl;-   X¹ is selected from nitrogen and C—R²;-   X² is selected from nitrogen and C—R³;-   X³ is selected from nitrogen and C—R⁴;-   X⁴ is selected from nitrogen and C—R⁵;-   with the proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₁-C₄ haloalkyl,    C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, cyano, amino, nitro, mono- or    dialkylamino, C₃-C₇ cycloalkyl, 5 to 6 membered heteroaryl, the 5 to    6 membered heteroaryl being optionally substituted with one, two, or    three substituents selected from C₁-C₄ alkyl, and phenyl, the phenyl    being optionally substituted with one, two, or three substituents    selected from halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy,    and C₁-C₄ haloalkoxy;-   with the proviso that zero, one, two, or three of R² to R⁵ are    different from hydrogen,-   and salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and C₁-C₄ alkyl;-   X¹ is selected from nitrogen and C—R²;-   X² is selected from nitrogen and C—R³;-   X³ is selected from nitrogen and C—R⁴;-   X⁴ is selected from nitrogen and C—R⁵;-   with the proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₁-C₄ haloalkyl,    C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, cyano, amino, nitro, mono- or    dialkylamino, hydroxy, carboxyl, C₃-C₇ cycloalkyl, 5 to 6 membered    heteroaryl, the 5 to 6 membered heteroaryl being optionally    substituted with one, two, or three substituents selected from C₁-C₄    alkyl, and phenyl, the phenyl being optionally substituted with one,    two, or three substituents selected from halogen, C₁-C₄ alkyl, C₁-C₄    haloalkyl, C₁-C₄ alkoxy, and C₁-C₄ haloalkoxy;-   with the proviso that zero, one, two, or three of R² to R⁵ are    different from hydrogen,-   and salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is selected from nitrogen and C—R²-   X² is selected from nitrogen and C—R³-   X³ is selected from nitrogen and C—R⁴-   X⁴ is selected from nitrogen and C—R⁵-   with the proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, C₁-C₄    haloalkoxy, cyano, amino, nitro, dialkylamino, hydroxy, carboxyl,    C₃-C₇ cycloalkyl, triazolyl (bonded via N), thiazolyl, thienyl,    pyridyl, pyrazolyl (bonded via N or C), the pyrazolyl being    optionally substituted with one or two substituents selected from    C₁-C₄ alkyl, imidazolyl, pyrrolyl, and phenyl, the phenyl being    optionally substituted with one or two substituents selected from    halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, and C₁-C₄    haloalkoxy;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is selected from nitrogen and C—R²-   X² is selected from nitrogen and C—R³-   X³ is selected from nitrogen and C—R⁴-   X⁴ is selected from nitrogen and C—R⁵-   with the proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, methyl, isopropyl, iso-butyl, sec-butyl,    tert-butyl, trifluoromethyl, methoxy, ethoxy, isopropoxy,    trifluoromethoxy, trifluoroethoxy, cyano, amino, nitro,    dimethylamino, hydroxy, carboxyl, cyclopropyl, cyclopentyl,    triazolyl (bonded via N), thiazolyl, thienyl, pyridyl, pyrazolyl    (bonded via N or C), the pyrazolyl being optionally substituted with    one or two methyl groups, imidazolyl, pyrrolyl, and phenyl, the    phenyl optionally being substituted with one or two substituents    selected from methyl, trifluoromethyl, methoxy, ethoxy, isopropoxy,    trifluoromethoxy, fluorine and chlorine;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is selected from nitrogen and C—R²-   X² is selected from nitrogen and C—R³-   X³ is selected from nitrogen and C—R⁴-   X⁴ is selected from nitrogen and C—R⁵-   with the proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, and phenyl, the phenyl being optionally    substituted with one, two, or three substituents selected from    halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, and C₁-C₄    haloalkoxy;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and C₁-C₄ alkyl;-   X¹ is selected from nitrogen and C—R²;-   X² is selected from nitrogen and C—R³;-   X³ is selected from nitrogen and C—R⁴;-   X⁴ is selected from nitrogen and C—R⁵;-   with the proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and-   R², R³ and R⁴ are hydrogen, and R⁵ is selected from hydrogen,    halogen, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy,    C₁-C₄ haloalkoxy, cyano, amino, nitro, mono- or dialkylamino,    hydroxy, thiol, carboxyl, C₃-C₇ cycloalkyl, 5 to 6 membered    heteroaryl, the 5 to 6 membered heteroaryl being optionally    substituted with one, two, or three substituents selected from C₁-C₄    alkyl, and phenyl, the phenyl being optionally substituted with one,    two, or three substituents selected from halogen, C₁-C₄ alkyl, C₁-C₄    haloalkyl, C₁-C₄ alkoxy, and C₁-C₄ haloalkoxy, or-   a group of a formula selected from —CO—NR⁷R⁸, —NH—CO—R⁹, —CO—O—R⁹,    —CO—R⁹, —SO₂R¹⁰, —SO₂NR¹¹R¹², —SR¹⁰, CH₂CN, —CH₂NR¹¹R¹², —CH₂OR¹⁰,    wherein-   R⁷ and R⁸ independently from each other represent hydrogen, C₁-C₄    alkyl, C₆ aryl, and 5-6 membered heteroaryl;-   R⁹ represents hydrogen, C₁-C₄ alkyl, C₆ aryl, and 5-6 membered    heteroaryl;-   R¹⁰ represents C₁-C₄ alkyl;-   R¹¹ and R¹² independently from each other represent hydrogen, and    C₁-C₄ alkyl;-   with the proviso that zero, one, two, or three of R² to R⁵ are    different from hydrogen,-   and salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₁-C₄ haloalkyl,    C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, cyano, amino, nitro, mono- or    dialkylamino, hydroxy, carboxyl, C₃-C₇ cycloalkyl, 5 to 6 membered    heteroaryl, the 5 to 6 membered heteroaryl being optionally    substituted with one, two, or three substituents selected from C₁-C₄    alkyl, and phenyl, the phenyl being optionally substituted with one,    two, or three substituents selected from halogen, C₁-C₄ alkyl, C₁-C₄    haloalkyl, C₁-C₄ alkoxy, and C₁-C₄ haloalkoxy;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, C₁-C₄    haloalkoxy, cyano, amino, nitro, dialkylamino, C₃-C₇ cycloalkyl,    triazolyl (bonded via N), thiazolyl, thienyl, pyridyl, pyrazolyl    (bonded via N or C), the pyrazolyl being optionally substituted with    one or two substituents selected from C₁-C₄ alkyl, and phenyl, the    phenyl being optionally substituted with one or two substituents    selected from halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy,    and C₁-C₄ haloalkoxy;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, C₁-C₄    haloalkoxy, cyano, amino, nitro, dialkylamino, hydroxy, carboxyl,    C₃-C₇ cycloalkyl, triazolyl (bonded via N), thiazolyl, thienyl,    pyridyl, pyrazolyl (bonded via N or C), the pyrazolyl being    optionally substituted with one or two substituents selected from    C₁-C₄ alkyl, imidazolyl, pyrrolyl, and phenyl, the phenyl being    optionally substituted with one or two substituents selected from    halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, and C₁-C₄    haloalkoxy;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, methyl, isopropyl, iso-butyl, sec-butyl,    tert-butyl, trifluoromethyl, methoxy, ethoxy, isopropoxy,    trifluoromethoxy, trifluoroethoxy cyano, amino, nitro,    dimethylamino, hydroxy, carboxyl, cyclopropyl, cyclopentyl,    triazolyl (bonded via N), thiazolyl, thienyl, pyridyl, pyrazolyl    (bonded via N or C), the pyrazolyl being optionally substituted with    one or two methyl groups, imidazolyl, pyrrolyl, and phenyl, the    phenyl optionally being substituted with one or two substituents    selected from methyl, trifluoromethyl, methoxy, ethoxy, isopropoxy,    trifluoromethoxy, fluorine and chlorine;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵;-   R², R³, and R⁴, are independently from each other selected from    hydrogen, and fluorine;-   R⁵ is selected from hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl,    C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, cyano, amino, nitro, dialkylamino,    hydroxy, carboxyl, C₃-C₇ cycloalkyl, triazolyl (bonded via N),    thiazolyl, thienyl, pyridyl, pyrazolyl (bonded via N or C), the    pyrazolyl being optionally substituted with one or two substituents    selected from C₁-C₄ alkyl, imidazolyl, pyrrolyl, and phenyl, the    phenyl being optionally substituted with one or two substituents    selected from halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy,    and C₁-C₄ haloalkoxy;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵;-   R² is fluorine; R³, and R⁴, are hydrogen;-   R⁵ is selected from hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl,    C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, cyano, amino, nitro, dialkylamino,    hydroxy, carboxyl, C₃-C₇ cycloalkyl, triazolyl (bonded via N),    thiazolyl, thienyl, pyridyl, pyrazolyl (bonded via N or C), the    pyrazolyl being optionally substituted with one or two substituents    selected from C₁-C₄ alkyl, imidazolyl, pyrrolyl, and phenyl, the    phenyl being optionally substituted with one or two substituents    selected from halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy,    and C₁-C₄ haloalkoxy;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵; and-   R², R³, R⁴, and R⁵ are independently from each other selected from    hydrogen, halogen, and phenyl, the phenyl optionally being    substituted with one or two substituents selected from methyl,    trifluoromethyl, methoxy, ethoxy, isopropoxy, trifluoromethoxy,    fluorine and chlorine;-   with the proviso that zero, one, or two of R² to R⁵ are different    from hydrogen,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴,-   X⁴ is C—R⁵, and-   R¹, R², R³, R⁴, and R⁵ are as defined above.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is hydrogen or methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵-   R² to R⁴ are selected from hydrogen and fluorine, and-   R⁵ is selected from halogen;-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is hydrogen or methyl;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵-   R² to R⁴ are selected from hydrogen and fluorine, and-   R⁵ is selected from chlorine and bromine;-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is hydrogen;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵-   R² to R⁴ are hydrogen, and-   R⁵ is chlorine;-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is hydrogen;-   X¹ is C—R²-   X² is C—R³-   X³ is C—R⁴-   X⁴ is C—R⁵; and-   R², R³, and R⁴ are hydrogen, R⁵ is chlorine, in form of its    hydrochloride salt.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is selected from hydrogen and methyl;-   X¹, X², X³ and X⁴ are as defined above,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   R¹ is hydrogen,-   X¹, X², X³ and X⁴ are as defined above,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   X¹ is N-   X² is C—R³-   X³ is C—R⁴,-   X⁴ is C—R⁵, and-   R¹, R³, R⁴, and R⁵ are as defined above,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   X¹ is C—R²-   X² is N,-   X³ is C—R⁴,-   X⁴ is C—R⁵, and-   R¹, R², R⁴, and R⁵ are as defined above,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   X¹ is C—R²-   X² is C—R³,-   X³ is N,-   X⁴ is C—R⁵, and-   R¹, R², R³, and R⁵ are as defined above,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   X¹ is C—R²-   X² is C—R³,-   X³ is C—R⁴,-   X⁴ is N, and-   R¹, R², R³, and R⁴ are as defined above.-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   X¹ is N,-   X² is C—R³,-   X³ is C—R⁴,-   X⁴ is N, and-   R¹, R³, and R⁴ are as defined above,-   and its salts, solvates, and solvates of the salts.

According to an embodiment of the present invention, the compounds ofthe formulae (I-A) or (I-B) are defined as follows:

-   X¹ is N,-   X² is N,-   X³ is C—R⁴,-   X⁴ is C—R⁵, and-   R¹, R⁴ and R⁵ are as defined above,-   and its salts, solvates, and solvates of the salts.

The definitions of radicals indicated specifically in the respectivecombinations of radicals are replaced as desired irrespective of theparticular combinations indicated for the radicals also by definitionsof radicals of other combinations.

According to an embodiment of the invention, two or more of theembodiments mentioned above are combined.

The invention furthermore provides a process for preparing the compoundsof the formula (IV)

-   in which R¹, X¹, X², X³, and X⁴ each have the meaning given above    and R⁶ represents an amino protective group, wherein

[A] a compound of the formula (II-A)

-   in which R¹ and R⁶ each have the meaning given above, is reacted    with a compound of the formula (III)

-   in which X¹, X², X³, and X⁴ each have the meaning given above in an    inert solvent, optionally in the presence of a base, to give a    compound of the formula (IV)

-   in which R¹, R⁶, X¹, X², X³, and X⁴ each have the meaning given    above,-   or

[B] a compound of the formula (II-B)

-   in which R¹ has the meaning given above and R⁶ represents an amino    protective group, is reacted with a compound of the formula (III)

-   in which X¹, X², X³, and X⁴ each have the meaning given above in an    inert solvent, optionally in the presence of a base, to give a    compound of the formula (IV)

-   in which R¹, R⁶, X¹, X², X³, and X⁴ each have the meaning given    above.

The invention furthermore provides a process for preparing the compoundsof the formula (IV)

-   in which R¹, X¹, X², X³, and X⁴ each have the meaning given above    and R⁶ represents an amino protective group, wherein

[B] a compound of the formula (II-B)

-   in which R¹ and R⁶ each have the meaning given above, is reacted    with a compound of the formula (III)

-   in which X¹, X², X³, and X⁴ each have the meaning given above in an    inert solvent, optionally in the presence of a base, to give a    compound of the formula (IV)

-   in which R¹, R⁶, X¹, X², X³, and X⁴ each have the meaning given    above.

The invention furthermore provides a regioselective process forpreparing the compounds of the formula (IV)

-   in which R¹, X¹, X², X³, and X⁴ each have the meaning given above    and R⁶ represents an amino protective group, wherein

[B] a compound of the formula (II-B)

-   in which R¹, has the meaning given above and R⁶ represents an amino    protective group, is reacted with a compound of the formula (III)

-   in which X¹, X², X³, and X⁴ each have the meaning given above in an    inert solvent, optionally in the presence of a base, to give a    compound of the formula (IV)

-   in which R¹, X¹, X², X³, and X⁴ each have the meaning given above,    and R⁶ represents an amino protective group.

The term “regioselective process” within the meaning of the invention isdefined as a process that yields a compound of formula (IV) wherein lessthan 20%, less than 15%, less than 10%, less than 5%, less than 3%, lessthan 2%, less than 1%, less than 0.5%, less than 0.1% or 0% of thecompound of formula (IV) is present as the regioisomer of the compoundof formula IV shown below

According to an embodiment of the invention, R⁶ is an acid cleavableamino protective group, such as tert-butoxycarbonyl (Boc), and thecompound of the formula (IV) obtained in reaction [A] or [B] is reactedto the compound of the formula (I-B) by addition of an acid.

According to an embodiment of the invention, the compound of the formula(I-A) is obtained by treating the compound of formula (I-B) with a base.

According to an embodiment of the invention, the compound of the formula(I-A) is obtained by treating the compound of formula (I-B) by asuitable chromatographic method by using a basic eluent.

According to an embodiment of the invention, R⁶ is not cleavable by anacid and the compound of the formula (I-A) is obtained from the compoundof formula (IV) by cleaving the amino protective group of the compoundof formula (IV) for example by hydrogenation. Examples for this reactionare the cleavage of benzyloxycarbonyl (Cbz), and of optionallysubstituted benzyl.

According to an embodiment of the invention, the compound of the formula(I-B) is obtained by treating the compound of formula (I-A) with anacid.

The resulting compounds of the formulae (I-A) or (I-B) are optionallyconverted with the appropriate (i) solvents and/or (ii) acids or basesinto their solvates, salts and/or solvates of the salts.

The present invention also provides compounds of the general formula(IV)

-   wherein R¹, R⁶, X¹, X², X³, and X⁴ each have the meaning given    above. The present invention also provides a compound of the general    formula (II-B)

-   wherein-   R¹ is selected from hydrogen and C₁-C₄ alkyl and-   R⁶ is an amino protective group.

The present invention also provides a compound of the general formula(II-B)

-   wherein-   R¹ is selected from hydrogen and methyl and-   R⁶ is selected from tert-butoxycarbonyl (Boc), and benzyloxycarbonyl    (Cbz).

The present invention also provides a compound of the general formula(II-B)

-   wherein-   R¹ is selected from hydrogen and C₁-C₄ alkyl and-   R⁶ is tert-butoxycarbonyl (Boc).

Further compounds of formula (I-A) or (I-B) according to the inventioncan optionally also be prepared by converting functional groups ofindividual substituents, starting with the compounds of the formula(I-A) and (I-B) obtained by the above processes. These conversions arecarried out by customary methods known to the person skilled in the artand include, for example, reactions such as nucleophilic andelectrophilic substitutions, oxidations, reductions, hydrogenations,transition metal-catalyzed coupling reactions, eliminations, alkylation,amination, esterification, ester cleavage, etherification, ethercleavage, formation of carboxamides, and also the introduction andremoval of temporary protective groups.

The preparation processes described can be illustrated in an exemplarymanner by the synthesis schemes below (Schemes 1 and 2).

Suitable amino protecting groups (substituent R⁶) in formulae (II-A),(II-B), and (IV) are tert-butoxycarbonyl (Boc), removed by aconcentrated strong acid, benzyloxycarbonyl (Cbz), removed byhydrogenolysis, methyl or ethylcarbamate, removed by TMSI in CHCl₃ orHBr in AcOH, Trimethylsilylethyl carbamate (Teoc), removed by fluoride,p-Methoxybenzyl carbamate (Moz or MeOZ), removed by hydrogenolysis,9-Fluorenylmethyl carbamate (F-moc), removed by a base, and optionallysubstituted benzyl or benzylamine, removed by hydrogenolysis. Preferredfor use as amino protective group is tert-butoxycarbonyl (Boc).

According to an embodiment of the invention, the amino protective groupR⁶ is selected from tert-butoxycarbonyl (Boc), and benzyloxycarbonyl(Cbz). Preferred for use as amino protective group istert-butoxycarbonyl (Boc).

The reaction can also be carried out without protecting the amino group.In this case, R⁶ is hydrogen.

According to an embodiment of the invention, the reaction is carried outwithout protecting the amino group. In this embodiment, R⁶ is hydrogen.

The invention furthermore provides a process for preparing the compoundsof the formula (IV)×

-   in which R¹, X¹, X², X³, and X⁴ each have the meaning given above    and R⁶ is hydrogen, wherein

[A] a compound of the formula (II-A)

-   -   in which R¹ has the meaning given above and R⁶ is hydrogen, is        reacted with a compound of the formula (III)

-   -   in which X¹, X², X³, and X⁴ each have the meaning given above in        an inert solvent, optionally in the presence of a base, to give        a compound of the formula (IV)

-   -   in which R¹, X¹, X², X³, and X⁴ each have the meaning given        above and R⁶ is hydrogen,

-   or

[B] a compound of the formula (II-B)

-   -   in which R¹ has the meaning given above and R⁶ is hydrogen, is        reacted with a compound of the formula (III)

-   -   in which X¹, X², X³, and X⁴ each have the meaning given above in        an inert solvent, optionally in the presence of a base, to give        a compound of the formula (IV)

-   -   in which R¹, X¹, X², X³, and X⁴ each have the meaning given        above, and R⁶ is hydrogen.

Suitable solvents for the process steps (II-A)+(III)→(IV)+(regioisomerof (IV)) are inert solvents, for example, aliphatic alcohols such asmethanol, ethanol, iso-propanol, 1-methoxy-2-propanol or tert-butanol,ethers such as diethyl ether, dioxane, tetrahydrofuran, glycol dimethylether or diethylene glycol dimethyl ether, hydrocarbons such as benzene,toluene, xylene, hexane, cyclohexane or mineral oil fractions,halogenated hydrocarbons such as dichloromethane, trichloromethane,carbon tetrachloride, 1,2-dichloroethane, trichloroethylene orchlorobenzene, or other solvents such as acetone, ethyl acetate,acetonitrile, pyridine, dimethyl sulphoxide, N,N-dimethylformamide,N,N-dimethylacetamide, N,N′-dimethylpropyleneurea (DMPU) orN-methylpyrrolidone (NMP). It is also possible to use mixtures of thesolvents mentioned. Preference is given to polar solvents with highboiling points, such as toluene, 1-methoxy-2-propanol, and dioxane, ormixtures of these solvents.

The condensation process (II-A)+(III)→(IV)+(regioisomer of IV) mayproceed in the absence of a base, in the presence of organic bases suchas triethylamine or diisopropylethylamine, or in the presence ofinorganic bases. Inorganic bases include alkali metal or alkali earthmetal phosphates and carbonates such as potassium phosphate, potassiumcarbonate, cesium carbonate, sodium phosphate, or calcium carbonate.Preference is given to the presence of potassium phosphate.

According to an embodiment of the invention, the compounds of formulae(II-A) and (III) are reacted in the presence of a base, in particular inthe presence of an inorganic base, preferably in the presence ofpotassium phosphate.

The condensation process (II-A)+(III)→(IV)+(regioisomer of IV) isgenerally carried out in a temperature range from 50° C. to 250° C.,preferably within 100° C. to 200° C. Heating options includeconventional heating below the boiling point of the solvent, underreflux, or above the boiling point of the solvent in a closed vial, orin a closed vial with the aid of a microwave reactor. Preference isgiven to heating the reaction in a microwave vial from 160° C. to 200°C.

According to an embodiment of the invention, the compounds of formulae(II-A) and (III) are reacted at a temperature of 50° C. to 250° C.,preferably at a temperature of 100° C. to 200° C.

The condensation process (II-A)+(III)→(IV)+(regioisomer of IV) can becarried out at atmospheric, elevated or reduced pressure (for examplefrom 0.5 to 25 bar). In general, the reactions are in each case carriedout at atmospheric pressure to 15 bar.

According to an embodiment of the invention, the compounds of formulae(II-A) and (III) are reacted at a pressure between atmospheric pressureand 15 bar.

Typically, the condensation process (II-A)+(III)→(IV)+(regioisomer ofIV) yields mixtures of regioisomers. The desired regioisomer is isolatedby a suitable chromatographic method such as chromatography on silicagel, reverse-phase high-performance liquid chromatography, orpreparative thin-layer chromatography. Inert solvents used as liquidphase include ethyl acetate, cyclohexane, dichloromethane, methanol,supercritical carbon dioxide, water, acetonitrile, and mixtures thereof.The desired regioisomer can further be isolated by crystallisation.

According to an embodiment of the invention, the compound of formula(IV) is isolated from the mixture of regioisomers.

The condensation process (II-B)+(III)→[(V)]→(IV) can be carried out inone single step without isolation of the intermediate (V), in twoseparate steps by changing the reaction conditions for the formation of(V) from (II-B) and (III) and the formation of (IV) from (V) but withoutpurification of the intermediate (V), or in two separate steps involvingthe purification of intermediate (V). Preference is given to a procedurewith two separate steps without purification of the intermediate.

According to an embodiment of the invention, the compounds of formulae(II-B) and (III) are reacted in a first step to a compound of formula(V). The compound of formula (V) is reacted in a second step to thecompound of formula (IV) without separation and purification of theintermediate (V). According to a further embodiment of the invention,the solvent is changed between the first and the second step.

Suitable solvents for the process steps (II-B)+(III)→(V) are, forexample, aliphatic alcohols such as methanol, ethanol, iso-propanol,1-methoxy-2-propanol or tert-butanol, ethers such as diethyl ether,dioxane, tetrahydrofuran, glycol dimethyl ether or diethylene glycoldimethyl ether, hydrocarbons such as benzene, toluene, xylene, hexane,cyclohexane or mineral oil fractions, halogenated hydrocarbons such asdichloromethane, trichloromethane, carbon tetrachloride,1,2-dichloroethane, trichloroethylene or chlorobenzene, or othersolvents such as acetone, ethyl acetate, acetonitrile, pyridine,dimethyl sulphoxide, N,N-dimethylformamide, N,N-dimethylacetamide,N,N′-dimethylpropyleneurea (DMPU) or N-methylpyrrolidone (NMP). It isalso possible to use mixtures of the solvents mentioned. Preference isgiven to using acetonitrile or toluene as solvents, or mixtures of thesesolvents.

Suitable solvents for the process steps (V)→(IV) are, for example,aliphatic alcohols such as methanol, ethanol, iso-propanol,1-methoxy-2-propanol or tert-butanol, ethers such as diethyl ether,dioxane, tetrahydrofuran, glycol dimethyl ether or diethylene glycoldimethyl ether, hydrocarbons such as benzene, toluene, xylene, hexane,cyclohexane or mineral oil fractions, halogenated hydrocarbons such asdichloromethane, trichloromethane, carbon tetrachloride,1,2-dichloroethane, trichloroethylene or chlorobenzene, or othersolvents such as acetone, ethyl acetate, acetonitrile, pyridine,dimethyl sulphoxide, N,N-dimethylformamide, N,N-dimethylacetamide,N,N′-dimethylpropyleneurea (DMPU) or N-methylpyrrolidone (NMP). It isalso possible to use mixtures of the solvents mentioned. Preference isgiven to using 1-methoxy-2-propanol or toluene as solvents, or mixturesof these solvents.

The process (II-B)+(III)→(V) may proceed in the absence of a base, inthe presence of organic bases such as triethylamine ordiisopropylethylamine, or in the presence of inorganic bases. Inorganicbases include alkali metal or alkali earth metal phosphates andcarbonates such as potassium phosphate, potassium carbonate, cesiumcarbonate, sodium phosphate, or calcium carbonate. Preference is givento reacting the compounds of formulae (II-B) and (III) in the absence ofa base.

According to an embodiment of the invention, the compounds of formulae(II-B) and (III) are reacted in the absence of a base.

The condensation process (V)→(IV) may proceed in the absence of a base,in the presence of organic bases such as triethylamine ordiisopropylethylamine, or in the presence of inorganic bases. Inorganicbases include alkali metal or alkali earth metal phosphates andcarbonates such as potassium phosphate, potassium carbonate, cesiumcarbonate, sodium phosphate, or calcium carbonate. Preference is givento reacting the compound of formula (V) to the compound of formula (IV)in the presence of potassium phosphate.

According to an embodiment of the invention, the compound of formula (V)is reacted to the compound of formula (IV) in the presence of a base, inparticular in the presence of potassium phosphate.

According to an embodiment of the invention, wherein the compounds offormulae (II-B) and (III) are reacted to the compound of formula (V) andthe compound of formula (V) is reacted to the compound of formula (IV)in one single step without isolation of the intermediate (V), thereaction is carried out in the presence of a base.

The process (II-B)+(III)→(V) is generally carried out in a temperaturerange of 0° C. to 100° C., preferably from 40° C. to 80° C.

According to an embodiment of the invention, the compounds of formulae(II-B) and (III) are reacted at a temperature of 0° C. to 100° C.,preferably of 40° C. to 80° C.

The process (V)→(IV) is generally carried out in a temperature range of0° C. to 150° C., preferably from 60° C. to 130° C.

According to an embodiment of the invention, the compound of formula (V)is reacted to a compound of formula (IV) at a temperature of 0° C. to150° C., preferably of 60° C. to 130° C.

According to an embodiment of the invention, wherein R⁶ is an acidcleavable amino protective group, such as tert-butoxycarbonyl, thecompound of the formula (IV) obtained in reaction [A] or [B] is reactedto the compound of the formula (I-B) by addition of an acid. Thisreaction is carried out in a suitable solvent, e.g. dioxane.

Generally, the salts of formula (I-B) may be transformed to therespective free bases of formula (I-A) by any way known to the personskilled in art.

The compound of formula (I-B) may be reacted to the compound of formula(I-A) by treating the compound of formula (I-B) with a base. Preferredbases are ammonia, sodium hydroxide, NaHCO₃, and Na₂CO₃. This may alsobe achieved by a suitable chromatographic method by using a basiceluent.

According to an embodiment of the invention, the acid used to obtain thecompound of the formula (I-B) from the compound of the formula (IV) isselected from hydrochloric acid, trifluoroacetic acid, acetic acid,sulphuric acid, maleic acid, tartaric acid, ascorbic acid, and salicylicacid.

According to an embodiment of the invention, wherein R⁶ is not cleavedby an acid, the compound of the formula (I-A) is obtained from thecompound of formula (IV) by cleaving the amino protection group of thecompound of formula (IV) for example by hydrogenation. Examples for thisreaction are the cleavage of benzyloxycarbonyl (Cbz), and of optionallysubstituted benzyl.

The compounds of the formulae (II-A), (III) and (II-B) are commerciallyavailable, known from the literature or can be prepared analogously toprocesses known from the literature or described in schemes 3 to 7below. Schemes 8 and 9 relate to processes to obtain alkyl or(hetero)aryl compounds from the respective halogenated compounds.

EXPLANATION OF THE FIGURES

FIG. 1: X-ray diffractogram of the acetate of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66).

FIG. 2: X-ray diffractogram of the maleate of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66).

FIG. 3: X-ray diffractogram of the sulfate of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66).

The compounds of formula (I-A) or (I-B) according to the invention haveuseful pharmacological properties and can be employed for the preventionand treatment of disorders in humans and animals. The compounds offormula (I-A) or (I-B) according to the invention open up a furthertreatment alternative and are therefore an enrichment of pharmacy.

The compounds of formula (I-A) or (I-B) according to the invention bringabout an inhibition of clot lysis (fibrinolysis), lead to an increase inclot stability (clot firmness) and thereby to a reduction of bleeding,re-bleeding and blood loss. These effects are due to direct inhibitionof plasminogen, the central precursor of plasmin, a potent serineprotease involved in the dissolution of fibrin blood clots.

The compounds of formula (I-A) or (I-B) according to the invention aresuitable for the treatment and/or prophylaxis of acute and recurrentbleeding in patients with or without underlying hereditary or acquiredbleeding disorders. The compounds of formula (I-A) or (I-B) according tothe invention are also suitable for the treatment and/or prophylaxis ofacute and recurrent bleeding in patients with or without underlyinghereditary or acquired hemostatic disorders. The compounds of formula(I-A) or (I-B) according to the invention are also suitable for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith or without underlying hereditary rare bleeding disorders. Thecompounds of formula (I-A) or (I-B) according to the invention are alsosuitable for the treatment and/or prophylaxis of hereditary or acquiredbleeding disorders, hereditary or acquired hemostatic disorders, andrare bleeding disorders.

Within the meaning of the present invention, the term underlyinghereditary or acquired bleeding disorders comprises von Willebrand'sdisease, platelet disorders/dysfunctions like Glantzmann'sthrombasthenia and thrombocytopenia, and vitamin K deficiency, PAI-1deficiency, mild and moderate hemophilia, including hemophilia A (factorVIII deficiency), hemophilia B (factor IX deficiency), and hemophilia C(factor XI deficiency), symptomatic carriers of hemophilia and otherhereditary bleeding disorders, autoimmune disorders that lead to theformation of antibodies against the coagulation factor, blood cancers,bone marrow diseases, infections, kidney failure, liver disease,medications, medications, including heparin, low molecular weightheparin, and coumarin derivatives, like warfarin, accidental injuriesand surgical interventions leading to massive blood loss and resultingin a critical reduction in the level of coagulation factors which canlead to additional non-surgical bleeding complications (e.g.coagulopathic bleeding), acquired von Willebrand syndrome (AVWS),characterized by structural or functional defects of von Willebrandfactor (VWF) that are secondary to autoimmune, lymphoproliferative ormyeloproliferative, malignant, cardiovascular, or other disorders.

Within the meaning of the present invention, the term mild hemophilia isdefined as a level of clotting factor activity of the respectivedeficient factor of 5% to 50% of the normal level, the term moderatehemophilia is defined as a level of clotting factor activity of therespective deficient factor of 1% to 5% of the normal level.

Within the meaning of the present invention, the term underlyinghereditary or acquired hemostatic disorders is defined as pathologicalprocesses resulting in abnormal bleeding or clotting.

Within the meaning of the present invention, the term underlyinghereditary rare bleeding disorders (RBD) is defined as bleedingdisorders caused by hereditary disorders, that are less common than e.g.hemophilia A and B or von Willebrand disease. Rare bleeding disordersinclude deficiency of fibrinogen, prothrombin, factors V, combinedfactors V+VIII, factor VII, factor X, factor XI or factor XIII.

The compounds of formula (I-A) or (I-B) according to the invention canbe used in a wide range of hemorrhagic conditions like uppergastrointestinal bleeding, hemorrhages caused by antifibrinolytics, andgynecological bleeding indications including menorrhagia (heavymenstrual bleeding, HMB), placental bleeding, postpartum hemorrhage andconisation of the cervix.

Within the meaning of the present invention, menorrhagia (heavymenstrual bleeding, HMB) is defined as menstrual blood loss of 60 ml ormore per cycle, for example 60 to 80 ml per cycle, in particular morethan 80 ml per cycle. Also within the meaning of the present inventionand according to National Institute for Clinical Excellence (NICE)guidelines, menorrhagia is defined for clinical purposes as excessivemenstrual blood loss which interferes with the woman's physical,emotional, social and material quality of life, and which can occuralone or in combination with other symptoms.

In particular, the compounds of formula (I-A) or (I-B) according to theinvention can be used in menorrhagia (heavy menstrual bleeding, HMB)caused by underlying bleeding disorders, for example hereditary oracquired bleeding disorders, such as von Willebrand's disease, plateletdisorders/dysfunctions like Glantzmann's thrombasthenia andthrombocytopenia, and vitamin K deficiency, PAI-1 deficiency, mild andmoderate hemophilia, including hemophilia A (factor VIII deficiency),hemophilia B (factor IX deficiency), and hemophilia C (factor XIdeficiency), symptomatic carriers of hemophilia and other hereditarybleeding disorders, such as deficiency of fibrinogen, prothrombin,factors V, combined factors V+VIII, factor VII, factor X, factor XI, orfactor XIII, autoimmune disorders, blood cancers, bone marrow diseases,infections, kidney failure, liver disease, medications, includingheparin, low molecular weight heparin, and coumarin derivatives, likewarfarin, accidental injuries and surgical interventions leading tomassive blood loss and resulting in a critical reduction in the level ofcoagulation factors, and acquired von Willebrand syndrome (AVWS).

The compounds of formula (I-A) or (I-B) according to the invention canalso be used for reducing peri- and postoperative blood loss andrebleeding during and after different surgical interventions, includingcardiovascular surgery, including coronary artery bypass surgery, spinalsurgery, trauma surgery, transplantation, including orthotopic livertransplantation, and hysterectomy, as well as transfusion requirementsin patients with or without underlying bleeding disorders. Moreover, thecompounds of formula (I-A) or (I-B) according to the invention can beused for the prevention of recurrence of bleeding in patients afterelective minor surgery like prostatic surgery including prostatectomyand transurethral prostatic surgery, gynaecological surgery, urinarysurgery, otolaryngological (ENT) surgery including tonsillectomy, andadenoidectomy, oral surgery, and dental surgery, in patients with orwithout underlying hereditary or acquired bleeding disorders.

The compounds of formula (I-A) or (I-B) according to the invention canalso be used for treatment and/or prophylaxis of acute and recurrentbleeding in patients with liver diseases, including patients withend-stage liver diseases in patients with or without underlying bleedingdisorders.

The compounds of formula (I-A) or (I-B) according to the invention canalso be used for treatment and/or prophylaxis of acute and recurrentbleeding in patients with trauma and/or traumatic hyphaema, hemorrhagicstroke, acute promyelocytic leukaemia, and to block plasmin-inducedproteolysis which may be of biological relevance duringathero-thrombosis and inflammatory states, cancer and other diseases inpatients with or without underlying hereditary or acquired bleedingdisorders.

The compounds of formula (I-A) or (I-B) according to the invention canalso be used for the treatment and/or prophylaxis of hereditary oracquired bleeding disorders in patients including von Willebrand'sdisease, platelet disorders/dysfunctions like Glantzmann'sthrombasthenia and thrombocytopenia, and vitamin K deficiency, PAI-1deficiency, mild and moderate hemophilia, including hemophilia A (factorVIII deficiency), hemophilia B (factor IX deficiency), and hemophilia C(factor XI deficiency), symptomatic carriers of hemophilia and otherhereditary bleeding disorders, such as deficiency of fibrinogen,prothrombin, factors V, combined factors V+VIII, factor VII, factor X,factor XI or factor XIII, autoimmune disorders, blood cancers, bonemarrow diseases, infections, kidney failure, liver disease, medications,medications, including heparin, low molecular weight heparin, andcoumarin derivatives, like warfarin, accidental injuries and surgicalinterventions leading to massive blood loss and resulting in a criticalreduction in the level of coagulation factors, and acquired vonWillebrand syndrome (AVWS).

The compounds of the present invention can be used either alone asmonotherapy or in combination with other therapies to address a bleedingdisorder. For instance, co-administration of one or more compounds ofthe invention with a plasma-derived or recombinant coagulation factorsuch as factor VIIa, factor VIII, factor IX or desmopressin is believeduseful for treating hemophilia.

The compounds of formula (I-A) or (I-B) according to the invention canalso be used for treating synovitis, wherein the synovitis may beassociated with cartilage damage and is associated with hemarthrosis inpatients with or without underlying hereditary or acquired bleedingdisorders.

The compounds of formula (I-A) or (I-B) according to the invention canalso be used for the treatment of nosebleed (epistaxis) caused by traumaor other causes in patients with or without underlying hereditary oracquired bleeding disorders.

The compounds of formula (I-A) or (I-B) according to the invention canalso be used for the treatment and/or prophylaxis of hereditary oracquired bleeding disorders in patients.

The present invention further relates to the use of the compounds offormula (I-A) or (I-B) according to the invention for the treatmentand/or prophylaxis of diseases, in particular the aforementioneddiseases.

An embodiment of the present invention is also a compound of formula(I-A) or (I-B) according to the invention for use in a method for thetreatment and/or prophylaxis of diseases.

An embodiment of the present invention is also a compound of formula(I-A) or (I-B) according to the invention for use in a method for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith or without underlying hereditary or acquired bleeding disorders.

An embodiment of the present invention is also a compound of formula(I-A) or (I-B) according to the invention for use in a method for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith underlying hereditary or acquired bleeding disorders.

An embodiment of the present invention is also a compound of formula(I-A) or (I-B) according to the invention for use in a method for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith or without underlying hereditary or acquired bleeding disorders,wherein the bleeding is associated with a disease or medicalintervention selected from the group consisting of menorrhagia,postpartum hemorrhage, hemorrhagic shock, trauma, surgery, includingotolaryngological, cardiovascular, and spinal surgery, liver or lungtransplantation, stroke, liver diseases, hereditary angioedema,nosebleed, and synovitis.

An embodiment of the present invention is also a compound of formula(I-A) or (I-B) according to the invention for use in a method for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith underlying hereditary or acquired bleeding disorders, wherein thebleeding is associated with a disease or medical intervention selectedfrom the group consisting of menorrhagia, postpartum hemorrhage,hemorrhagic shock, trauma, surgery, including otolaryngological,cardiovascular, and spinal surgery, liver or lung transplantation,stroke, liver diseases, hereditary angioedema, nosebleed, and synovitis.

An embodiment of the present invention is also a medicament comprising acompound of the formula (I-A) or (I-B) according to the invention incombination with an inert, non-toxic, pharmaceutically suitableauxiliary.

An embodiment of the present invention is also a medicament comprising acompound of the formula (I-A) or (I-B) according to the invention incombination with a further active compound selected from the groupconsisting of Factor VIII, Factor IX, Factor VIIa, activated prothrombincomplex concentrates (aPCC) or prothrombin complex concentrates (PCCs),ε-aminocaproic acid, ethamsylate, paraaminobutyl benzoic acid,tranexamic acid, desmopressin, danazol, combined oral contraceptivepills (COCPs), progestin intrauterine system, glucocorticoid receptoragonists, analgesics, and nonsteroidal anti-inflammatory drugs (NSAIDs).

An embodiment of the present invention is also a medicament comprising acompound of the formula (I-A) or (I-B) according to the invention asdescribed above for the treatment and/or prophylaxis of acute andrecurrent bleeding in patients with or without underlying hereditary oracquired bleeding disorders.

An embodiment of the present invention is also a medicament comprising acompound of the formula (I-A) or (I-B) according to the invention asdescribed above for the treatment and/or prophylaxis of acute andrecurrent bleeding in patients with underlying hereditary or acquiredbleeding disorders.

An embodiment of the present invention is also a medicament comprising acompound of the formula (I-A) or (I-B) according to the invention asdefined above for the treatment and/or prophylaxis of acute andrecurrent bleeding in patients with or without underlying hereditary oracquired bleeding disorders, wherein the bleeding is associated with adisease or medical intervention selected from the group consisting ofmenorrhagia, postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, gynaecological surgery, cardiovascular surgery, spinal surgery,liver or lung transplantation, stroke, liver diseases, hereditaryangioedema, nosebleed, and synovitis and cartilage damage followinghemarthrosis.

An embodiment of the present invention is also a medicament comprising acompound of the formula (I-A) or (I-B) according to the invention asdefined above for the treatment and/or prophylaxis of acute andrecurrent bleeding in patients with underlying hereditary or acquiredbleeding disorders, wherein the bleeding is associated with a disease ormedical intervention selected from the group consisting of menorrhagia,postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, cardiovascular surgery, spinal surgery, liver or lungtransplantation, stroke, liver diseases, hereditary angioedema,nosebleed, and synovitis and cartilage damage following hemarthrosis.

An embodiment of the present invention is also a method for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith or without underlying hereditary or acquired bleeding disorders inhumans and animals using an effective amount of at least one compound ofthe formula (I-A) or (I-B) according to the invention or a medicamentcomprising a compound of the formula (I-A) or (I-B) according to theinvention as defined above.

An embodiment of the present invention is also a method for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith underlying hereditary or acquired bleeding disorders in humans andanimals using an effective amount of at least one compound of theformula (I-A) or (I-B) according to the invention or a medicamentcomprising a compound of the formula (I-A) or (I-B) according to theinvention as defined above.

An embodiment of the present invention is also a method for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith or without underlying hereditary or acquired bleeding disorders inhumans and animals using an effective amount of at least one compound ofthe formula (I-A) or (I-B) according to the invention or a medicamentcomprising a compound of the formula (I-A) or (I-B) according to theinvention as defined above, wherein the bleeding is associated with adisease or medical intervention selected from the group consisting ofmenorrhagia, postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, cardiovascular surgery, spinal surgery, liver or lungtransplantation, stroke, liver diseases, hereditary angioedema,nosebleed, and synovitis and cartilage damage following hemarthrosis.

An embodiment of the present invention is also a method for thetreatment and/or prophylaxis of acute and recurrent bleeding in patientswith underlying hereditary or acquired bleeding disorders in humans andanimals using an effective amount of at least one compound of theformula (I-A) or (I-B) according to the invention or a medicamentcomprising a compound of the formula (I-A) or (I-B) according to theinvention as defined above, wherein the bleeding is associated with adisease or medical intervention selected from the group consisting ofmenorrhagia, postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, cardiovascular surgery, spinal surgery, liver or lungtransplantation, stroke, liver diseases, hereditary angioedema,nosebleed, and synovitis and cartilage damage following hemarthrosis.

The efficacy of the compounds of formula (I-A) and (I-B) according ofthe invention for the treatment and/or prophylaxis of hereditary oracquired bleeding disorders, and of acute and recurrent bleeding inpatients with or without underlying hereditary or acquired bleedingdisorders, wherein the bleeding is associated with a disease or medicalintervention selected from the group consisting of menorrhagia,postpartum hemorrhage, hemorrhagic shock, trauma, surgery,otolaryngological surgery, dental surgery, urinary surgery, prostaticsurgery, cardiovascular surgery, spinal surgery, liver or lungtransplantation, stroke, liver diseases, hereditary angioedema,nosebleed, and synovitis and cartilage damage following hemarthrosis,can be demonstrated for example by a reduction in blood loss(quantitative and laboratory values), by a shortened duration ofbleeding, by an increased clot firmness, by a lower incidence ofrecurrent bleeding, by an improved quality of life, which may in thecase of menorrhagia be determined by the Menorrhagia ImpactQuestionnaire, the number of medical visits, and/or by improvedcompliance due to less frequent dosing as compared to e.g. lysineanalogs, including tranexamic acid and ε-aminocaproic acid.

The compound of formula (I-A) or (I-B) need not be, but is optionallyadministered with one or more agents currently used to prevent or treatthe disorder in question. The effective amount of such other agentsdepends on the amount of compound of the invention present, the type ofdisorder or treatment. These are generally used in the same dosages andwith administration routes as used hereinbefore or about from 1 to 99%of the heretofore employed dosages. The present invention furtherrelates to medicaments containing at least one of the compounds offormula (I-A) or (I-B) according to the invention and one or morefurther active substances, in particular for the treatment and/orprophylaxis of the aforementioned diseases. As suitable combinationactive substances, we may mention for example and preferably:

Factor VIII, Factor IX, Factor VIIa, activated prothrombin complexconcentrates (aPCC) or prothrombin complex concentrates (PCCs),ε-aminocaproic acid, ethamsylate, paraaminobutyl benzoic acid,tranexamic acid, desmopressin, danazol, combined oral contraceptivepills (COCPs), progestin intrauterine systems, glucocorticoid receptoragonists, analgesics, and nonsteroidal anti-inflammatory drugs (NSAIDs).

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in a combination withthe coagulation factor commonly known as Factor VIII, any derivatives,fragments, muteins or conjugates thereof.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in a combination withthe coagulation factor commonly known as Factor IX, any derivatives,fragments, muteins or conjugates thereof.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in a combination withthe coagulation factor commonly known as Factor VIIa, any derivatives,fragments, muteins or conjugates thereof.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in a combination withactivated prothrombin complex concentrates (aPCCs) or prothrombincomplex concentrates (PCCs).

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in a combination withantifibrinolytic agents such as, by way of example and preferably,ε-aminocaproic acid, ethamsylate, paraaminobutyl benzoic acid, andtranexamic acid.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in a combination withdesmopressin.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in a combination withdanazol.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in combination withcombined oral contraceptive pills (COCPs) such as, by way of example andpreferably, combinations of an estrogen, for example the syntheticestrogen ethinylestradiol or the natural estrogens estradiol andestradiolderivatives, preferably estradiolester, such asestradiolvalerate and estradiolhydrate, and a gestagen for exampleprogesterone, trimegestone, medroxyprogesterone acetate, megestrolacetate, cyproterone acetate, chlormadinone acetate, nestorone,levonorgestrel, norgestimate, desogestrel, ethonogestrel(3-Ketodesogestrel), nomegestrol acetate (NOMAC), norethisterone acetate(NETA), drospirenone, gestodene, dienogest, norethindrone acetate,danazole, norgestrel, and tanaproget.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in combination withintrauterine devices, including progestine impregnated intrauterinedevices, e.g. LNG-IUS levonorgestrel intrauterine system.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in combination with aglucocorticoid receptor agonist, such as, by way of example andpreferably, cortisol, cortisone, hydrocortisone, prednisone,methyl-prednisolone, prednylidene, deflazacort, fluocortolone,triamcinolone, dexamethasone or betamethasone.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in combination withnonsteroidal anti-inflammatory drugs (NSAIDs), such as by way of exampleand preferably acetylsalicylic acid, diclofenac, flurbiprofen,ibuprofen, indomethacin, mefenamic acid, meclofenamic acid, andnaproxen.

In an embodiment of the invention, the compounds of formula (I-A) or(I-B) according to the invention are administered in combination withanalgesics, such as by way of example and preferably, acetaminophen,acetanilide, aminobenzoic acid, antipyrine, calcium or cholinesalicylate, codeine, phenatecin, phenyltoloxamine citrate, salicylamide,sodium salicylate, and sodium para-aminobenzoate.

An embodiment of the invention is also a medicament, comprising acompound of the formula (I-A) or (I-B) as defined above in combinationwith a further active compound selected from the group consisting ofFactor VIII, Factor IX, Factor VIIa, activated prothrombin complexconcentrates (aPCC) or prothrombin complex concentrates (PCCs),ε-aminocaproic acid, ethamsylate, paraaminobutyl benzoic acid,tranexamic acid, desmopressin, danazol, hormonal treatments, includingcombined oral contraceptive pills (COCPs), progestin intrauterinesystem, glucocorticoid receptor agonists, analgesics, and nonsteroidalanti-inflammatory drugs (NSAIDs).

An embodiment of the invention is also a medicament as defined above forthe treatment and/or prophylaxis of hereditary or acquired bleedingdisorders, trauma, surgery, stroke, menorrhagia, including heavymenstrual bleeding in women with underlying bleeding disorders,postpartum hemorrhage, liver diseases, and hereditary angioedema.

An embodiment of the invention is also a method for the treatment and/orprophylaxis of hereditary or acquired bleeding disorders, trauma,surgery, stroke, menorrhagia, including heavy menstrual bleeding inwomen with underlying bleeding disorders, postpartum hemorrhage, liverdiseases, and hereditary angioedema in humans and animals using aneffective amount of at least one compound of the formula (I-A) or (I-B)as defined above or a medicament as defined above.

The present invention further relates to medicaments that contain atleast one compound of formula (I-A) or (I-B) according to the invention,usually together with one or more inert, non-toxic, pharmaceuticallysuitable auxiliaries, and use thereof for the aforementioned purposes.

The compounds of formula (I-A) or (I-B) according to the invention maybe effective after systemic and/or local administration. For thispurpose they can be applied in a suitable way, e.g. by oral, parenteral,pulmonary, nasal, sublingual, lingual, buccal, rectal, dermal,transdermal, conjunctival, or otic administration or as implant orstent.

For these routes of application, the compounds of formula (I-A) or (I-B)according to the invention can be administered in suitable dosage forms.

Dosage forms functioning according to the prior art, for rapid and/ormodified release of the compounds according to the invention, whichcontain the compounds of formula (I-A) or (I-B) according to theinvention in crystalline and/or amorphized and/or dissolved form, e.g.tablets (uncoated or coated tablets, for example with enteric coatingsor coatings with delayed dissolution or insoluble coatings, whichcontrol the release of the compound formula (I-A) or (I-B) according tothe invention), tablets or films/wafers that disintegrate rapidly in theoral cavity, films/lyophilizates, capsules (for example hard or softgelatin capsules), sugar-coated pills, granules, pellets, powders,emulsions, suspensions, aerosols or solutions, are suitable for oraladministration.

Parenteral administration can take place avoiding an absorption step(e.g. intravenous, intraarterial, intracardiac, intraspinal orintralumbar) or including absorption (e.g. intramuscular, subcutaneous,intracutaneous, percutaneous or intraperitoneal). Injection and infusionpreparations in the form of solutions, suspensions, emulsions,lyophilizates or sterile powders are suitable, among others, as dosageforms for parenteral application. Intravenous administration can takeplace for example by bolus administration or by continuous infusion.

Inhaled pharmaceutical forms (including powder inhalers, nebulizers),nasal drops, nasal solutions or nasal sprays, tablets, films/wafers orcapsules for lingual, sublingual or buccal application, suppositories,ear or eye preparations, vaginal capsules, aqueous suspensions (lotions,shaking mixtures), lipophilic suspensions, ointments, creams,transdermal therapeutic systems (e.g. patches), milk, pastes, foams,dusting powders, implants or stents for example are suitable for otherroutes of administration.

In one embodiment, the compounds of formula (I-A) or (I-B) according tothe invention can be administered in the form of nasal drops, nasalsolutions or nasal sprays for the treatment and/or prophylaxis of acuteand recurrent nosebleed in patients, in particular in patients withunderlying hereditary or acquired bleeding disorders.

In one embodiment, the compounds of formula (I-A) or (I-B) according tothe invention can be administered in the form of patches soaked with thecompounds of formula (I-A) or (I-B) according to the invention andapplied to the wound for the treatment and/or prophylaxis of acute andrecurrent bleeding in patients, in particular in patients withunderlying hereditary or acquired bleeding disorders.

In one embodiment, the compounds of formula (I-A) or (I-B) according tothe invention are administered intra-muscular, rectal or transvaginalfor the treatment and/or prophylaxis of acute and recurrent bleeding inpatients with trauma and other forms of acute bleeding, in particular inpatients with underlying hereditary or acquired bleeding disorders.

In one embodiment, the compounds of formula (I-A) or (I-B) according tothe invention are administered in form of a swish and swallow or alozenge for the treatment and/or prophylaxis of acute and recurrentmouth bleeding in patients, in particular in patients with underlyinghereditary or acquired bleeding disorders. A swish and swallow route ofadministration is defined as the administration of a liquid substance tothe oral mucosa by swishing the drug inside the mouth for a certainamount of time then allowed to be swallowed. The drug action is bothtopical and systemic.

The compounds of formula (I-A) or (I-B) according to the invention canalso be used in vitro or ex vivo to inhibit fibrinolysis, for examplefor in vitro/ex vivo assays, to inhibit fibrinolysis in blood and plasmaproducts, to pretreat catheters and other medicinal devices andequipment, for surface coatings or in biological samples.

The compounds of formula (I-A) or (I-B) according to the invention canbe transformed to the aforementioned dosage forms. This can take placein a manner known per se by mixing with inert, non-toxic,pharmaceutically suitable auxiliaries. These auxiliaries include interalia carriers (for example microcrystalline cellulose, lactose,mannitol), solvents (e.g. liquid polyethylene glycols), emulsifiers anddispersants or wetting agents (for example sodium dodecyl sulphate,polyoxysorbitan oleate), binders (for example polyvinylpyrrolidone),synthetic and natural polymers (for example albumin), stabilizers (e.g.antioxidants such as ascorbic acid), colorants (e.g. inorganic pigments,for example iron oxides) and taste and/or odour correctants.

An embodiment of the invention are pharmaceutical compositionscomprising at least one compound of formula (I-A) or (I-B) according tothe invention, preferably together with at least one inert, non-toxic,pharmaceutically suitable auxiliary, and the use of these pharmaceuticalcompositions for the above cited purposes.

For the prevention or treatment of disease, the appropriate dosage of acompound of the invention (when used alone or in combination with otheragents) will depend on the type of disease to be treated, the type ofcompound, the severity and course of the disease, whether the compoundis administered for preventive or therapeutic purposes, previoustherapy, the patient's clinical history and response to the compound,and the discretion of the attending physician. The compound is suitablyadministered to the patient at one time or over a series of treatments.Depending on the type and severity of disease, about 0.1 μg/kg to 100mg/kg of the compound is an initial candidate dosage for administrationto the patient, whether for example, by one or more separateadministrations, or by continuous infusion. A typical daily dosage mightrange from about 0.1 μg/kg to 100 mg/kg or more, depending on thefactors mentioned above. For repeated administrations over several daysor longer, depending on the condition, the treatment is sustained untila desired suppression of disease symptoms occurs. An initial higherloading dose, followed by one or more lower doses may be administered.However, other dosing regimen may be useful. The progress of thistherapy is easily monitored by conventional techniques and assays.

In general, it has proved advantageous, in the case of parenteraladministration, to administer amounts of about 2 to 300 mg/kg bodyweight every 24 hours to achieve effective results. For oralapplication, the dosage is about 2 to 600 mg/kg body weight every 24hours.

According to a further embodiment, it has proved advantageous, in thecase of oral or parenteral administration, to administer amounts in arange of from 0.1 to 300 or from 0.5 to 50 or from 1 to 50 or from 2 to10 mg/kg body weight every 24 hours to achieve effective results.

Nevertheless, it may optionally be necessary to deviate from the statedamounts, namely depending on body weight, route of administration,individual response to the active substance, type of preparation andtime point or interval when application takes place. Thus, in some casesit may be sufficient to use less than the aforementioned minimum amount,whereas in other cases the stated upper limit must be exceeded. Whenapplying larger amounts, it may be advisable to distribute these inseveral individual doses throughout the day.

According to a further embodiment, the compounds of formula (I-A) or(I-B) according to the invention are administered orally once or twiceor three times a day. According to a further embodiment, the compoundsof formula (I-A) or (I-B) according to the invention are administeredorally once or twice a day. According to a further embodiment, thecompounds of formula (I-A) or (I-B) according to the invention areadministered orally once a day. For the oral administration, a rapidrelease or a modified release dosage form may be used.

According to a further embodiment, the compounds of formula (I-A) or(I-B) according to the invention are administered orally once or twiceor three times a day on 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10days per month. According to a further embodiment, the compounds offormula (I-A) or (I-B) according to the invention are administeredorally once or twice or three times a day on 2 or 3 or 4 or 5 or 6 or 7or 8 or 9 or 10 consecutive days per month. According to a furtherembodiment, the compounds of formula (I-A) or (I-B) according to theinvention are administered orally once or twice or three times a day on3 or 4 or 5 or 6 or 7 days per month. According to a further embodiment,the compounds of formula (I-A) or (I-B) according to the invention areadministered orally once or twice or three times a day on 3 or 4 or 5 or6 or 7 consecutive days per month.

The following practical examples explain the invention. The invention isnot limited to the examples.

The percentages in the following tests and examples are percentages byweight, unless stated otherwise; parts are parts by weight. Proportionsof solvents, dilution ratios and concentrations for liquid/liquidsolutions refer in each case to the volume.

A. EXAMPLES

Abbreviations and Acronyms:

[α] specific rotation value AcOH acetic acid Boc tert-butoxycarbonyl br.broad signal (NMR coupling pattern) CDI N,N′-carbonyldiimidazole Conc.concentrated CPhos2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)-1,1′- biphenyl δNMR shift in ppm d doublet (NMR coupling pattern) DCM dichloromethaneDIPEA diisopropyl ethyl amine DMAP 4-N,N-dimethylaminopyridine DMFN,N-dimethylformamide DMSO dimethylsulfoxide EDCIN-ethyl-N′-(3-dimethylaminopropyl)carbodiimide hydrochloride ESIelectrospray ionisation (MS) GC-MS gas chromatography coupled to massspectrometry HATU 1-[Bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxid hexafluorophosphate HOBt 1-hydroxybenzotriazolehydrate HPLC high performance liquid chromatography LC-MS liquidchromatography coupled to mass spectrometry m multiplet (NMR couplingpattern) MS mass spectrometry MTBE tert-butyl methyl ether NMR nuclearmagnetic resonance q quartet (NMR coupling pattern) R_(t) retention timeRT room temperature s singlet (NMR coupling pattern) t triplet (NMRcoupling pattern) TFA trifluoroacetic acid UV ultraviolet WL wavelengthXPhos 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenylPreparative HPLCMethod 1A

Column: Chromatorex C18 48 μm 100×30 5 μm, Flow: 50 mL/min, Eluent: A:acetonitrile B: water/0.1% formic acid, Gradient 20% A→90% A

Method 2A

Column: Xbridge 100×30 5 μm, Flow: 50 mL/min, Eluent: A: acetonitrile B:water/0.2% ammonia, Gradient 10% A→95% A

LC-MS-Methods:

Method 1B

Instrument: Waters ACQUITY SQD UPLC system; column: Waters Acquity UPLCHSS T3 1.8μ50×1 mm; eluent A: 1 l water+0.25 ml 99% HCOOH, eluent B: 1 lacetonitrile+0.25 ml 99% HCOOH; gradient: 0.0 min 90% A→1.2 min 5% A→2.0min 5% A; oven: 50° C.; flow: 0.40 ml/min; UV-detection: 208-400 nm.

Method 2B

Instrument MS: Waters (Micromass) QM; Instrument HPLC: Agilent 1100series; column: Agilent ZORBAX Extend-C18 3.0×50 mm 3.5 μm; Eluent A: 1l water+0.01 mol ammonium carbonate, eluent B: 1 l acetonitrile;gradient: 0.0 min 98% A→0.2 min 98% A→3.0 min 5% A→4.5 min 5% A; Oven:40° C.; Flow: 1.75 ml/min; UV-detection: 210 nm

Method 3B

Instrument: Micromass Quattro Premier with Waters UPLC Acquity; Column:Thermo Hypersil GOLD 1.9μ 50×1 mm; Eluent A: 11 Wasser+0.5 ml 50% formicacid, Eluent B: 1 l Acetonitril+0.5 ml 50% formix acid; Gradient: 0.0min 97% A→0.5 min 97% A→3.2 min 5% A→4.0 min 5% A Oven: 50° C.; Flow:0.3 ml/min; UV-detection: 210 nm.

Method 4B

Instrument MS: Waters (Micromass) ZQ; Instrument HPLC: Agilent 1100Series; Column: Agilent ZORBAX Extend-C18 3.0×50 mm 3.5-Micron; EluentA: 1 L water+0.01 mol ammonium carbonate, Eluent B: 1 L acetonitrile;Gradient: 0.0 min 98% A→0.2 min 98% A→3.0 min 5% A→4.5 min 5% A; Oven:40° C.; Flow: 1.75 ml/min; UV-detection: 210 nm

Method 5B

Instrument: Waters ACQUITY SQD UPLC system; column: Waters Acquity UPLCHSS T3 1.8μ30×2 mm; eluent A: 1 l water+0.25 ml 99% formic acid, eluentB: 1 l acetonitrile+0.25 ml 99% formic acid; gradient: 0.0 min 90% A→1.2min 5% A→2.0 min 5% A oven: 50° C.; flow: 0.60 ml/min; UV-detection:208-400 nm.

Method 6B

Instrument: Waters ACQUITY SQD UPLC system; column: Waters Acquity UPLCHSS T3 1.8μ50×1 mm; eluent A: 1 l water+0.25 ml 99% formic acid, eluentB: 1 l acetonitrile+0.25 ml 99% formic acid; gradient: 0.0 min 95% A→6.0min 5% A→7.5 min 5% A oven: 50° C.; flow: 0.35 ml/min; UV-detection:210-400 nm.

Method 7B

Instrument MS: Waters (Micromass) QM; Instrument HPLC: Agilent 1100Series; Column: Agilent ZORBAX Extend-C18 3.0×50 mm 3.5-Micron; EluentA: 1 L water+0.01 mol ammonium carbonate, Eluent B: 1 L acetonitrile;Gradient: 0.0 min 98% A→0.2 min 98% A→3.0 min 5% A→4.5 min 5% A; Oven:40° C.; Flow: 1.75 ml/min; UV-detection: 210 nm.

Method 8B

Instrument: Agilent MS Quad 6150; HPLC: Agilent 1290; Column: WatersAcquity UPLC HSS T3 1.8 50×2.1 mm; Eluent A: 1 l water+0.25 ml 99%formic acid, Eluent B: 1 l acetonitrile+0.25 ml 99% formic acid;Gradient: 0.0 min 90% A→0.3 min 90% A→1.7 min 5% A→3.0 min 5% A Oven:50° C.; Flow: 1.20 ml/min; UV-Detection: 205-305 nm.

Preparative Separation of Diastereomers:

Method 1C

Phase: Chiracel OD-H, 5 μm 25 mm×50 mm, eluent: CO₂/methanol 81:19;pressure: 135 bar, temperature eluent: 38° C.; temperature zyklon: 40°C., pressure zyklon: 24 bar, flow: 200 g/min; UV-Detection: 210 nm.

Method 2C

Phase: Daicel AD-H, 5 μm 250 mm×20 mm, eluent: iso-hexane/ethanol 7/3;temperature: 25° C.; flow: 20 ml/min; UV-Detection: 230 nm.

Method 3C

Phase: Daicel Chiralpak AZ-H, 5 μm 250 mm×20 mm, eluent:iso-hexane/ethanol 6:4; temperature: 25° C.; flow: 15 ml/min;UV-Detection: 220 nm.

Method 4C

Phase: Daicel Chiralpak AZ-H, 5 μm 250 mm×30 mm, eluent:iso-hexane/isopropanol 1/1; temperature: 25° C.; flow: 35 ml/min;UV-Detection: 230 nm.

Method 5C

Phase: Daicel Chiralpak AS-H 5 μm 25 mm×20 mm; eluent:iso-hexane/ethanol 70:30; temperature: 25° C.; flow: 20 ml/min;UV-Detection: 220 nm.

Preparative Separation of Enantiomers:

Method 1D

Phase: Daicel Chiralpak IC, 5 μm 250 mm×20 mm, eluent:iso-hexan/isopropanol 70:30; temperature: 30° C.; flow: 20 ml/min;UV-Detection: 230 nm.

Analytical Separation of Diastereomers:

Method 1E

Phase: 250 mm×4.6 mm Chiracel OD-H 5 μm, eluent: methanol, temperature:35° C., flow: 4 ml/min, UV-Detection: 210 nm

Method 2E

Phase: 250 mm×4.6 mm Daicel Chiralpak AD-H 5 μm, eluent:iso-hexane/ethanol 1/1, temperature: 30° C., flow: 1.0 ml/min;UV-Detection: 220 nm

Method 3E

Phase: 250 mm×4.6 mm Daicel Chiralpak AZ-H 5 μm, eluent:iso-hexane/ethanol/TFA/H₂O 60%/40%/0.2%/1%, temperature: 40° C., flow:1.0 ml/min; UV-Detection: 220 nm

Method 4E

Phase: 250 mm×4.6 mm Daicel Chiralpak AZ-H 5 μm, eluent:iso-hexane/2-propanol 1/1, temperature: 30° C., flow: 1.0 ml/min;UV-Detection: 220 nm

Method 5E

Phase: Daicel Chiralpak AS-H 5 μm 25 mm×4.6 mm; eluent:iso-hexane/ethanol 70:30; temperature: 30° C., flow: 1 ml/min,UV-Detection: 220 nm

Analytical Separation of Enantiomers:

Method 1F

Phase: 250 mm×4.6 mm Daicel Chiralpak AY-H 5 μm, eluent:iso-hexan/ethanol 9/1, temperature: 45° C., flow: 1.0 ml/min;UV-Detection: 220 nm

GC-MS-Methods:

Method 1G

Instrument: Thermo Scientific DSQII, Thermo Scientific Trace GC Ultra;Column: Restek RTX-35MS, 15 m×200 μm×0.33 μm; constant Helium flow: 1.20ml/min; Oven: 60° C.; Inlet: 220° C.; Gradient: 60° C., 30° C./min→300°C. (hold for 3.33 min).

Method 2G

Instrument: Thermo DFS, Trace GC Ultra; Column: Restek RTX-35, 15 m×200m×0.33 μm; constant Helium flow: 1.20 ml/min; Oven: 60° C.; Inlet: 220°C.; Gradient: 60° C., 30° C./min→300° C. (hold for 3.33 min).

Other Remarks

Microwave Instrument: Biotage Initiator

Starting Materials and Intermediates:

General Procedures:

General Procedure 1A: Condensation of (aza)aminoindazoles under standardconditions.

A mixture of tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(1 eq) and the corresponding (aza)aminoindazol (1 eq.) in acetonitrilewas stirred at 60° C. until HPLC and/or LC-MS indicated completeconsumption of the starting material. After evaporating the solventunder vacuo the crude product was dissolved in 1-methoxy-2-propanol andthen potassium phosphate (2 eq) was added in to the mixture. Thereaction mixture was stirred at 110° C. until complete consumption ofthe intermediate. The work-up is described individually for eachexample.

Example 1A Tert-butyl4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate

To a solution of boc-isonipecotic acid (150 g, 654 mmol) intetrahydrofuran (2100 mL) was added di-1H-imidazol-1-ylmethanone (159 g,981 mmol) and N,N-dimethylpyridin-4-amine (40.0 g, 327 mmol) at RT. Themixture was stirred at RT for 15 h (CAUTION: moderate gas evolution). Ina second flask, a suspension of potassium 3-ethoxy-3-oxopropanoate (200g, 1.18 mol) and magnesium dichloride (112 g, 1.18 mol) intetrahydrofuran (2100 mL) was heated to 50° C. for 15 h. The resultingwarm suspension was slowly added to the first flask under extensivestirring. The resulting mixture was stirred at RT for 20 h.Tetrahydrofuran was evaporated in vacuo, water (1500 mL) and ethylacetate (1500 mL) were added. The mixture was cooled to 10° C. and 3Naqueous HCl was added until pH 1 was achieved. The organic phase wasseparated, the aqueous phase was extracted with ethyl acetate (1500 mL)and the combined organic phases were washed with 10% aq. NaHCO₃ (750 mL)and 10% aq. NaCl (750 mL), dried over magnesium sulfate, filtered andevaporated in vacuo to yield the title compound (182 g, 505 mmol) in apurity of 83%.

LC-MS (Method 1B): R_(t)=1.00 min, MS (ESIPos): m/z=300 [M+H]⁺

Example 2A Tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate

To a solution of 1-(tert-butoxycarbonyl)piperidine-4-carboxylic acid (10g, 43.6 mmol) and 2,2-dimethyl-1,3-dioxane-4,6-dione (6.9 g, 47.98 mmol)in 100 ml dichloromethane was added 4-dimethylaminopyridin (8.0 g, 65.42mmol). After cooling the mixture to 0° C.1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (11.7 g,61.1 mmol) was added in portions and then the reaction mixture wasstirred at RT for 16 h. The mixture was treated with 50 ml of water andthen the layers were separated. The organic layer was extracted with HCl1M, dried over magnesium sulfate, filtered and evaporated under vacuo toyield the title compound (14 g, 86% of theory).

LC-MS (Method 1B): R_(t)=1.10 min, MS (ESIPos): m/z=354 [M−H]⁻

Example 3A 2-Methylisonicotinic acid

To a solution of 2,4-lutidine (280 g, 2.61 mol) in water (3.0 l) at 80°C. was added potassium permanganate (826 g, 5.23 mol) in small portionsover 3 h. The reaction mixture was stirred at 80° C. overnight. Themixture was filtered through silica gel and then the filtrate wasevaporated under vacuo until a volume of approximately of 20 ml wasachieved. Then the solution was treated with HCl 37% (450 ml) until pH3-4 was achieved. The solution was kept 1 h at 0° C. and then theresulting solid was filtered, washed with water at 0° C. and finallydried under vacuo overnight over phosphorus pentoxide to yield the titleproduct (130 g, 36% of theory).

LC-MS (Method 3B): R_(t)=0.20 min, MS (ESIPos): m/z=138 [M+H]⁺

Example 4A Methyl 2-methylisonicotinate

To methanol (1.54 l) at −10° C. was added slowly thionyl chloride (401g, 3.37 mol) and the solution was stirred 10 minutes at 0° C. Then wasadded 2-methylisonicotinic acid (154 g, 1.20 mol) and the reactionmixture was stirred at reflux temperature overnight. The mixture wasevaporated under vacuo, then diluted in ethyl acetated and finallytreated with a 10% sodium hydrogen carbonate aqueous solution until pH 7was achieved. After separation of the layers the aqueous phase wasextracted with ethyl acetate. All collected organic phases were driedover magnesium sulfate, evaporated under dried under vacuo. The crudeproduct was used in the next step without further purification (113.0 g,48% of theory), 72% purity).

LC-MS (Method 1B): R_(t)=0.43 min, MS (ESIPos): m/z=152 [M+H]⁺

Example 5A Methyl 2-methylpiperidine-4-carboxylate

To acetic acid (700 ml) were added methyl 2-methylisonicotinate (79 g,523 mmol) and platinum (IV) oxide (7.83 g, 34.5 mmol). The mixture washydrogenated in the autoclave at RT and 20 bar during two days. Afterthis time platinum (IV) oxide (5.00 g, 22.2 mmol) was added again andthe mixture was hydrogenated during two days more at RT and 20 bar.After filtration of the catalyst the filtrate was evaporated under vacuoto obtain the title compound in quantitative yield.

LC-MS (Method 2B): R_(t)=1.15 min, MS (ESIPos): m/z=158 [M+H]⁺

Example 6A (−)-Cis-1-benzyl 4-methyl2-methylpiperidine-1,4-dicarboxylate and (+)-Cis-1-benzyl 4-methyl2-methylpiperidine-1,4-dicarboxylate

To a solution of methyl 2-methylpiperidine-4-carboxylate (138 g, 394mmol) in dichloromethane (620 ml) was added N,N-diisopropylethylamine(331 g, 2.56 mol). The mixture was cooled to 0° C. and then benzylchloroformate (80.6 g, 473 mmol) was added slowly. The reaction mixturewas stirred 30 min at RT and then water was added in to the mixture.After separation of the layers the aqueous phase was extracted withdichloromethane and the collected organic layers were washed with water,dried over magnesium sulfate and evaporated. The crude product waspurified by silica gel chromatography with petrolether/ethyl acetate 8/2and finally the stereoisomers were separated by chromatography on chiralphase (Method 1D) to yield the title compounds in enantiomerically pureform.

(−)-Cis-1-benzyl 4-methyl 2-methylpiperidine-1,4-dicarboxylate

-   -   Yield: (26.7 g, 23% of theory)    -   HPLC (Method 1F): R_(t)=14.48 min    -   [α]²³ _(D)=−54.2 (c 0.9, acetonitrile)

(+)-Cis-1-benzyl 4-methyl 2-methylpiperidine-1,4-dicarboxylate

-   -   Yield: (23.3 g, 20% of theory)    -   HPLC (Method 1F): R_(t)=11.21 min    -   [α]²³ _(D)=+60.0 (c 0.365, acetonitrile)

Example 7A Cis-methyl 2-methylpiperidine-4-carboxylate

A solution of (−)-cis-1-benzyl 4-methyl2-methylpiperidine-1,4-dicarboxylate (25.00 g, 85.8 mmol) in ethanol(250 ml) was treated with palladium on charcoal 10% (1.83 g, 1.72 mmol)under hydrogen atmosphere at normal pressure and RT for 16 h. Themixture was filtered through celite and the filtrate was evaporated anddried under vacuo to yield the title compound (13.95 g, 96% of theory).

LC-MS (Method 2B): R_(t)=1.15 min, MS (ESIPos): m/z=158 [M+H]⁺

Example 8A Cis-1-tert-butyl 4-methyl2-methylpiperidine-1,4-dicarboxylate

To a solution of cis-methyl 2-methylpiperidine-4-carboxylate obtained inexample 7A (12.95 g, 82.34 mmol) in tetrahydrofuran (250 ml) under argonatmosphere was added di-tert-butyl dicarbonate (21.58 g, 98.88 mmol) andthe reaction mixture was stirred at RT overnight. The mixture wasevaporated under vacuo and the crude product was dissolved in ethylacetate and treated with a 10% citric acid aqueous solution. Afterseparation of the layers the organic layer was washed with 10% citricacid aqueous solution, with a saturated aqueous solution of sodiumhydrogen carbonate and finally with brine. The organic phase was driedover magnesium sulfate, filtered and evaporated to yield the titlecompound (27.16 g, 96% of theory), 75% pure according NMR). The crudeproduct was used in the next step without further purification.

MS (ESIPos): m/z=258 [M+H]⁺

Example 9A Cis-1-(tert-butoxycarbonyl)-2-methylpiperidine-4-carboxylicacid

To a solution of cis-1-tert-butyl 4-methyl2-methylpiperidine-1,4-dicarboxylate obtained in example 8A) (27.16 g,79.16 mmol, 75% purity) in a mixture of tetrahydrofuran (250 ml) andwater (125 ml) was added lithium hydroxide (10.1 g, 422 mmol) and themixture was stirred overnight at RT. The mixture was evaporated undervacuo and was diluted in water and ethyl acetate. After separation ofthe layers the aqueous phase was treated with HCl 37% until pH 4 wasachieved and then was extracted with ethyl acetate, dried over magnesiumsulfate, filtered and evaporated under vacuo to yield the title compound(18.4 g, 95% of theory).

¹H-NMR (400 MHz, DMSO-d₆): δ=12.27 (bs, 1H), 4.07-3.99 (m, 1H),3.67-3-61 (m, 1H), 3.06-2.98 (m, 1H), 1.89-1.76 (m, 4H), 1.62-1.53 (m,1H), 1.39 (s, 9H), 1.04 (d, 3H).

Example 10A (−)-Cis-tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]-2-methylpiperidine-1-carboxylate

To a solution ofcis-1-(tert-butoxycarbonyl)-2-methylpiperidine-4-carboxylic acidobtained in example 9A (17.3 g, 71.0 mmol) and2,2-dimethyl-1,3-dioxane-4,6-dione (11.3 g, 78.0 mmol) indichloromethane (190 ml) was added 4-dimethylaminopyridin (13.1 g, 107mmol). After cooling the mixture to 0° C.,1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (19.13 g,100.0 mmol) was added in portions and then the reaction mixture wasstirred at RT for 16 h. The mixture was treated with water and then thelayers were separated. The organic layer was washed with HCl 1M, driedover magnesium sulfate, filtered and evaporated under vacuo to yield thetitle compound (20.8 g, 79% of theory).

LC-MS (Method 1B): R_(t)=1.16 min, MS (ESIPos): m/z=370 [M+H]⁺

[α]²⁰=−71.36 (c. 0.625, methanol) WL=589 nm

Example 11A 6-Fluoro-1H-pyrazolo[4,3-b]pyridin-3-amine

To a solution of 3,5-difluoro-2-pyridincarbonitrile (2.00 g 14.3 mmol, 1eq) in ethanol (36 mL) was added hydrazine hydrate (1.04 mL, 21.4 mmol,1.5 eq) at RT. The mixture was heated to 70° C. for 15 h. After coolingto RT, the resulting suspension was evaporated. The residue wastriturated with ethyl acetate (20 mL), filtered, the residue was washedwith ethyl acetate (5 mL) and dried for 16 h at 50° C. in vacuo to yieldthe title compound 6-fluoro-1H-pyrazolo[4,3-b]pyridin-3-amine (0.56 g,80% purity, 80% of theory).

LC-MS (Method 2B): R_(t)=1.10 min, MS (ESIPos): m/z=153 [M+H]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=11.75 (br. s, 1H), 8.26 (dt, 1H), 7.58 (dd,1H), 5.47 (br. s, 2H).

Example 12A 4-Ethoxy-1H-indazol-3-amine

To a solution of 2-ethoxy-6-fluorobenzonitrile (2.00 g, 12.1 mmol, 1 eq)in ethanol (30 mL) was added hydrazine hydrate (0.884 mL, 18.1 mmol, 1.5eq) at RT. The mixture was heated to 70° C. for 30 h. After cooling toRT, water (20 mL) was added, the mixture was extracted with ethylacetate (2×50 mL), the combined organic phases were washed with brine(50 mL), dried over MgSO4, filtered and evaporated in vacuo. The residuewas triturated with MTBE (10 mL), filtered and the residue was dried for16 h at 50° C. in vacuo to yield the title compound4-ethoxy-1H-indazol-3-amine (1.01 g, 47% of theory).

LC-MS (Method 2B): R_(t)=1.76 min, MS (ESIPos): m/z=178 [M+H]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=11.36 (s, 1H), 7.08 (dd, 1H), 6.74 (d, 1H),6.28 (d, 1H), 4.94 (s, 2H), 4.11 (q, 2H), 1.41 (t, 3H).

Example 13A 7-Bromo-1H-pyrazolo[4,3-c]pyridin-3-amine

A solution of 3,5-dibromopyridine-4-carbonitrile (2.10 g, 8.02 mmol) andhydrazine hydrate (0.90 g, 17.6 mmol) in ethanol (18 mL) was heated in amicrowave at 125° C. for 1 h. The precipitate was collected and washedwith a mixture of petrol ether and ethanol to obtain the title compound(1.27 g, 72% of theory).

LC-MS (Method 1B): R_(t)=0.37 min, MS (ESIPos): m/z=213 [M+H]⁺

Example 14A 7-Fluoro-1H-indazol-3-amine

2,3-Difluorobenzonitril (1.00 g, 7.19 mmol) was dissolved in ethanol (10mL) and treated with hydrazine hydrate (0.54 g, 10.7 mmol). Afterstirring at 70° C. for 16 h, the mixture was cooled to RT andconcentrated in vacuo. The residue was dissolved in a mixture of waterand ethyl acetate. The aqueous layer was extracted once more with ethylacetate. The combined organic layers were washed with water and withbrine, dried over magnesium sulfate, concentrated in vacuo and dried toyield the title compound (0.98 g, 91% of theory)

LC-MS (Method 2B): R_(t)=1.45 min, MS (ESIPos): m/z=152 [M+H]⁺

Example 15A 1H-Pyrazolo[3,4-c]pyridin-3-amine

3-Fluoro-isonicotinonitrile (0.50 g, 4.10 mmol) was dissolved in ethanol(8 mL) and treated with hydrazine hydrate (0.31 g, 6.1 mmol). Afterstirring at 70° C. for 16 h, the mixture was cooled to RT andconcentrated in vacuo and dried to yield the title compound (0.66 g,100% of theory).

LC-MS (Method 2B): R_(t)=0.51 min, MS (ESIPos): m/z=135 [M+H]⁺

Example 16A 7-(Trifluoromethyl)-1H-indazol-3-amine

2-Fluoro-3-(trifluoromethyl)-benzonitrile (1.00 g, 5.29 mmol) wasdissolved in ethanol (11 mL) and treated with hydrazine hydrate (0.40 g,7.9 mmol). After stirring at reflux for 16 h, the mixture was cooled toRT, concentrated in vacuo and dried to yield the title compound (1.07 g,100% of theory).

LC-MS (Method 1B): R_(t)=0.74 min, MS (ESIPos): m/z=202 [M+H]⁺

Example 17A Tert-butyl4-(4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.50 g,5.01 mmol, 1 eq), 1H-indazol-3-amine (1.00 g, 7.52 mmol, 1.5 eq) andpotassium phosphate (2.13 g, 10.0 mmol, 2 eq) were suspended in1-methoxy-2-propanol (15 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was neutralized (pH 6-7) by theaddition of 1N HCl, diluted with water (60 mL), and extracted with ethylacetate (2×, 100 mL and 50 mL). The combined organic phases were washedwith brine (25 mL), dried over sodium sulfate, filtered and evaporatedin vacuo. The residue was triturated with acetonitrile (5 mL). Theprecipitate was filtered, washed with acetonitrile (8 mL) and dried for2 h at 50° C. in vacuo to give the title compound (239 mg, 13% oftheory).

LC-MS (Method 1B): R_(t)=0.98 min, MS (ESIPos): m/z=369 [M+H]⁺

Example 18A Tert-butyl4-[2-oxo-9-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (450 mg,81% purity, 1.22 mmol, 1 eq), 5-(trifluoromethyl)-1H-indazol-3-amine(245 mg, 1.22 mmol, 1.0 eq) and potassium phosphate (517 mg, 2.43 mmol,2 eq) were suspended in dioxane (4.3 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 150° C. for1 h. Another 1 eq of tert-butyl4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate was added and themixture was heated in a microwave to 150° C. for 1 h. Again, 1 eq oftert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate was addedand the mixture was heated in a microwave to 150° C. for 1 h. Thesolvent was evaporated in vacuo and the residue was diluted with water(20 mL), and extracted with ethyl acetate (2×, 50 mL and 25 mL). Thecombined organic phases were dried over sodium sulfate, filtered andevaporated in vacuo. The residue was purified by preparative HPLC(Method 1A). The combined product fractions were neutralized withaqueous ammonium hydroxide and acetonitrile was evaporated in vacuo. Theaqueous phase was extracted with ethyl acetate (30 mL), dried oversodium sulfate, filtered and evaporated in vacuo to yield the titlecompound (47 mg, 9% of theory) as solid.

LC-MS (Method 1B): R_(t)=1.17 min, MS (ESIPos): m/z=437 [M+H]⁺

Example 19A Tert-butyl4-(10-chloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (9.11 g,30.4 mmol, 1.5 eq), 4-chloro-1H-indazol-3-amine (3.4 g, 20.3 mmol, 1 eq)and potassium phosphate (8.61 g, 40.6 mmol, 2 eq) were suspended in1-methoxy-2-propanol (70 mL) and split to seven 20 mL microwave vials.The vials were capped and the mixture was heated in a microwave to 180°C. for 15 min. Another 1.5 eq of tert-butyl4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate was added in1-methoxy-2-propanol (2 mL for each vial), and the mixture was heated ina microwave to 180° C. for 15 min again. After cooling to RT, thecombined suspensions were evaporated in vacuo, diluted with water (150mL), neutralized (pH 6) by the addition of 1N HCl, and extracted withethyl acetate (2×, 200 mL). The combined organic phases were washed withwater (2×100 mL) and brine (50 mL) and evaporated in vacuo. Thepartially crystalline residue was triturated with ethyl acetate (50 mL).The precipitate was filtered, washed with ethyl acetate (20 mL) andacetonitrile (10 mL) and dried for 16 h at 50° C. in vacuo to yield thetitle compound (2.63 g, 96% purity, 31% of theory).

LC-MS (Method 1B): R_(t)=1.12 min, MS (ESIPos): m/z=403 [M+H]⁺

Example 20A Tert-butyl4-(10-fluoro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (0.66 g,2.2 mmol, 1 eq), 4-fluoro-1H-indazol-3-amine (0.50 g, 3.31 mmol, 1.5 eq)and potassium phosphate (0.936 g, 4.41 mmol, 2 eq) were suspended in1-methoxy-2-propanol (9 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with water (15 mL),neutralized (pH 5-6) by the addition of 1N HCl, and extracted with ethylacetate (2×, 15 mL). The combined organic phases were evaporated invacuo. The residue was triturated with water (30 mL), filtered, and theresidue was resuspended in acetonitrile (30 mL). The precipitate wasfiltered, washed with acetonitrile (2 mL) and dried for 16 h at 50° C.in vacuo to yield the title compound (62 mg, 7% of theory).

LC-MS (Method 1B): R_(t)=1.02 min, MS (ESIPos): m/z=387 [M+H]⁺

Example 21A Tert-butyl4-(9-chloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (450 mg,81% purity, 1.22 mmol, 1 eq), 5-chloro-1H-indazol-3-amine (204 mg, 1.22mmol, 1.0 eq) and potassium phosphate (517 mg, 2.43 mmol, 2 eq) weresuspended in dioxane (4.3 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 150° C. for 1 h.Another 1 eq of tert-butyl4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate was added and themixture was heated in a microwave to 150° C. for 1 h. The solvent wasevaporated in vacuo, the residue was diluted with water (20 mL) andextracted with ethyl acetate (2×, 50 mL and 25 mL). The combined organicphases were dried over sodium sulfate, filtered and evaporated in vacuo.The residue was purified by preparative HPLC (Method 1A). The combinedproduct fractions were neutralized with aqueous ammonium hydroxide andacetonitrile was evaporated in vacuo. The aqueous phase was extractedwith ethyl acetate (30 mL), dried over sodium sulfate, filtered andevaporated in vacuo to yield the title compound (30 mg, 6% of theory) assolid.

LC-MS (Method 2B): R_(t)=1.97 min, MS (ESIPos): m/z=403 [M+H]⁺

Example 22A Tert-butyl 4-(8,10-dichloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl4-(4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(50 mg, 0.136 mmol) and N-chlorosuccinimid (27 mg, 0.204 mmol) weredissolved in DMF (1.5 mL) in a 5 mL microwave vial. The vial was cappedand the mixture was heated in a microwave to 50° C. for 30 min. Thereaction mixture was purified by preparative HPLC (Method 1A). Thecombined product fractions were neutralized with aqueous ammoniumhydroxide and acetonitrile was evaporated in vacuo. The resultingsuspension was filtered, the residue was washed with water (10 ml) anddried for 16 h at 50° C. 10 in vacuo to give the title compound (17.3mg, 29% of theory).

LC-MS (Method 1B): R_(t)=1.22 min, MS (ESIPos): m/z=437 [M+H]⁺

Example 23A Tert-butyl4-(9-fluoro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (264 mg,0.882 mmol, 1 eq), 5-fluoro-1H-indazol-3-amine (200 mg, 1.32 mmol, 1.5eq) and potassium phosphate (374 mg, 1.76 mmol, 2 eq) were suspended in1-methoxy-2-propanol (2.6 mL) in a microwave vial. The vial was cappedand the mixture was heated in a microwave to 180° C. for 15 min. Aftercooling to RT, the suspension was diluted with water (20 mL),neutralized (pH 5-6) by the addition of 1N HCl, and extracted with ethylacetate (2×15 mL). The combined organic phases were evaporated in vacuo.The residue was triturated with acetonitrile (10 mL). The precipitatewas filtered, washed with acetonitrile (2 mL) and dried for 2 h at 50°C. in vacuo to yield the title compound (61.3 mg, 18% of theory).

LC-MS (Method 1B): R_(t)=1.02 min, MS (ESIPos): m/z=387 [M+H]⁺

Example 24A Tert-butyl4-(10-methoxy-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 4-methoxy-1H-indazol-3-amine (363 mg, 2.23 mmol, 1.5eq) and potassium phosphate (945 mg, 10.2 mmol, 2 eq) were suspended in1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with water (20 mL),neutralized (pH 5-6) by the addition of 1N HCl, and extracted with ethylacetate (2×50 mL). The combined organic phases were washed with brine(20 mL), dried over magnesium sulfate, filtered and evaporated in vacuo.The residue was purified by preparative HPLC (Method 1A). The combinedproduct fractions were neutralized with aqueous ammonium hydroxide andacetonitrile was evaporated in vacuo. The resulting suspension wasfiltered, the residue was washed with water (10 ml) and dried for 16 hat 50° C. in vacuo to give the title compound (128 mg, 14% of theory) aslight yellow solid.

LC-MS (Method 1B): R_(t)=1.04 min, MS (ESIPos): m/z=399 [M+H]⁺

Example 25A Tert-butyl4-(9-oxo-9,10-dihydropyrido[3′,2′:3,4]pyrazolo[1,5-a]pyrimidin-7-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (49 mg,0.497 mmol, 1 eq), 1H-pyrazolo[4,3-b]pyridin-3-amine (100 mg, 0.745mmol, 1.5 eq) and potassium phosphate (210 mg, 0.993 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (1.5 mL) in a microwave vial. The vialwas capped and the mixture was heated in a microwave to 180° C. for 15min. After cooling to RT, the suspension was diluted with water (20 mL),neutralized (pH 5-6) by the addition of 1N HCl, and extracted with ethylacetate (2×15 mL). The combined organic phases were evaporated in vacuo.The residue was triturated with water (40 mL). The precipitate wasfiltered, triturated with acetonitrile (6 mL), filtered, washed withacetonitrile (2 mL) and dried for 16 h at 50° C. The crude product waspurified by preparative HPLC (Method 1A). The combined product fractionswere neutralized with aqueous ammonium hydroxide and acetonitrile wasevaporated in vacuo. The aqueous phase was extracted with ethyl acetate(2×15 mL), dried over magnesium sulfate, filtered and evaporated invacuo to yield the title compound (15 mg, 8% of theory).

LC-MS (Method 1B): R_(t)=0.91 min, MS (ESIPos): m/z=370 [M+H]⁺

Example 26A Tert-butyl4-(10-bromo-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 4-bromo-1H-indazol-3-amine (472 mg, 2.27 mmol, 1 eq)and potassium phosphate (945 mg, 4.45 mmol, 2 eq) were suspended in1-methoxy-2-propanol (11.8 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with water (20 mL) andneutralized (pH 6) by the addition of 1N HCl. The precipitate wasfiltered, washed with water (10 mL), MTBE (4 mL) and dried for 16 h at50° C. in vacuo to yield the title compound (222 mg, 22% of theory).

LC-MS (Method 1B): R_(t)=1.13 min, MS (ESIPos): m/z=447 [M+H]⁺

Example 27A Tert-butyl4-[2-oxo-8-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 6-(trifluoromethyl)-1H-indazol-3-amine (448 mg, 2.27mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (11.8 mL) in a 20 mL microwave vial.The vial was capped and the mixture was heated in a microwave to 180° C.for 15 min. After cooling to RT, the suspension was diluted with water(50 mL) and neutralized (pH 5-6) by the addition of 1N HCl and extractedwith ethyl acetate (2×100 mL). The combined organic phases were washedwith brine (25 mL), dried over sodium sulfate, filtered and evaporatedin vacuo. The brown residue was triturated with MTBE (4 mL) underultrasound irradiation. The precipitate was filtered, washed with water(20 mL) and dried for 16 h at 50° C. in vacuo to yield the titlecompound (381 mg, 95% purity, 37% of theory) as off-white solid.

LC-MS (Method 1B): R_(t)=1.15 min, MS (ESIPos): m/z=437 [M+H]⁺

Example 28A Tert-butyl4-(10-(trifluoromethyl)-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 4-(trifluoromethyl)-1H-indazol-3-amine (448 mg, 2.27mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (11.8 mL) in a 20 mL microwave vial.The vial was capped and the mixture was heated in a microwave to 180° C.for 15 min. After cooling to RT, the suspension was diluted with water(20 mL) and neutralized (pH 5) by the addition of 1N HCl and extractedwith ethyl acetate (2×30 mL). The combined organic phases were washedwith brine (10 mL), dried over sodium sulfate, filtered and evaporatedin vacuo. The brown residue was purified by preparative HPLC (Method1A). The combined product fractions were evaporated in vacuo to removeacetonitrile. The resulting suspension was filtered, the residue waswashed with water (2 ml) and dried for 16 h at 50° C. in vacuo to yieldthe title compound (116 mg, 12% of theory) as colorless solid.

LC-MS (Method 1B): R_(t)=1.19 min, MS (ESIPos): m/z=437 [M+H]⁺

Example 29A Tert-butyl4-(8-tert-butyl-4-oxo-1,4-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 6-tert-butyl-1H-pyrazolo[3,4-b]pyridin-3-amine (448mg, 2.27 mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq)were suspended in 1-methoxy-2-propanol (11.8 mL) in a 20 mL microwavevial. The vial was capped and the mixture was heated in a microwave to180° C. for 15 min. After cooling to RT, the suspension was diluted withwater (20 mL) and neutralized (pH 6) by the addition of 1N HCl andextracted with ethyl acetate (2×50 mL). The combined organic phases werewashed with water (2×20 mL), brine (20 mL), dried over sodium sulfate,filtered and evaporated in vacuo. The brown residue was purified bypreparative HPLC (Method 1A). The combined product fractions wereevaporated in vacuo to remove acetonitrile. The resulting suspension wasfiltered, the residue was washed with water (2 ml) and dried for 16 h at50° C. in vacuo to yield the title compound (56.6 mg, 90% purity, 5% oftheory).

LC-MS (Method 2B): R_(t)=2.07 min, MS (ESIPos): m/z=426 [M+H]⁺

Example 30A Tert-butyl4-(8-(trifluoromethyl)-4-oxo-1,4-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq),4-methyl-6-(trifluoromethyl)-1H-pyrazolo[3,4-b]pyridin-3-amine (448 mg,2.27 mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (11.8 mL) in a 20 mL microwave vial.The vial was capped and the mixture was heated in a microwave to 180° C.for 15 min. After cooling to RT, the suspension was diluted with water(20 mL) and neutralized (pH 5-6) by the addition of 1N HCl. Theprecipitate was filtered and washed with water (10 mL). The combinedfiltrates were extracted with ethyl acetate (2×30 mL), adjusted to pH8-9 by the addition of 1N NaOH, and extracted with ethyl acetate (20mL). The combined organic phases were washed with water (2×10 mL), brine(10 mL), dried over sodium sulfate, filtered and evaporated in vacuo.The yellow residue was triturated with MTBE (5 mL) under ultrasoundirradiation, filtered and washed with MTBE (4 mL) and ethyl acetate (1mL). The filtrate was evaporated in vacuo and purified by preparativeHPLC (Method 1A). The combined product fractions were evaporated invacuo to remove acetonitrile. The resulting suspension was filtered, theresidue was washed with water (2 ml) and dried for 16 h at 50° C. invacuo to yield the title compound (123 mg, 12% of theory) as off-whitesolid.

LC-MS (Method 1B): R_(t)=1.08 min, MS (ESIPos): m/z=452 [M+H]⁺

Example 31A Tert-butyl4-(9-methyl-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 5-methyl-1H-indazol-3-ylamine (328 mg, 2.27 mmol, 1eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) were suspended in1-methoxy-2-propanol (11 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The yellow residue was triturated with MTBE (5 mL), filtered, washedwith ethyl acetate (1 mL) and dried for 16 h at 50° C. in vacuo to yieldthe title compound (148 mg, 95% purity, 17% of theory) as yellow solid.

LC-MS (Method 1B): R_(t)=1.04 min, MS (ESIPos): m/z=383 [M+H]⁺

Example 32A Tert-butyl4-(8-amino-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 6-amino-1H-indazol-3-ylamine (330 mg, 2.27 mmol, 1eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) were suspended in1-methoxy-2-propanol (11 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The yellow residue was triturated with acetonitrile (4 mL), filtered,washed with acetonitrile (2 mL) and dried for 16 h at 50° C. in vacuo toyield the title compound (31 mg, 4% of theory) as yellow solid.

LC-MS (Method 1B): R_(t)=0.81 min, MS (ESIPos): m/z=384 [M+H]⁺

Example 33A Tert-butyl4-(3,4-dimethyl-8-oxo-5,8-dihydropyrimido[1′,2′:1,5]pyrazolo[3,4-c]pyridazin-6-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,0.334 mmol, 1.5 eq), 4,5-dimethyl-1H-pyrazolo[3,4-C]pyridazin-3-amine(363 mg, 2.27 mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2eq) were suspended in 1-methoxy-2-propanol (11 mL) in a 20 mL microwavevial. The vial was capped and the mixture was heated in a microwave to180° C. for 15 min. After cooling to RT, the suspension was diluted with20 mL dichloromethane/methanol (4:1), filtered through a short pad ofsilica gel with 100 mL dichloromethane/methanol (4:1) and evaporated invacuo. The residue was triturated with MTBE (4 mL), filtered, washedwith ethyl acetate (1 mL). The filtrate was evaporated in vacuo andpurified by preparative HPLC (Method 1A). The combined product fractionswere evaporated in vacuo to remove acetonitrile and lyophilized to givethe title compound (62.3 mg, 7% of theory).

LC-MS (Method 1B): R_(t)=0.75 min, MS (ESIPos): m/z=399 [M+H]⁺

Example 34A Tert-butyl4-(8-fluoro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 6-fluoro-1H-indazol-3-ylamine (337 mg, 2.27 mmol, 1eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) were suspended in1-methoxy-2-propanol (11 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The residue was triturated with 4 mL MTBE/ethyl acetate (1:1), filtered,washed with ethyl acetate (2 mL) and dried for 16 h at 50° C. in vacuoto yield the title compound (66 mg, 7% of theory) as colorless solid.

LC-MS (Method 1B): R_(t)=1.01 min, MS (ESIPos): m/z=387 [M+H]⁺

Example 35A Tert-butyl4-(9-bromo-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 5-bromo-1H-indazol-3-ylamine (472 mg, 2.27 mmol, 1eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) were suspended in1-methoxy-2-propanol (11 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The residue was triturated with 4 mL MTBE/ethyl acetate (1:1), filtered,washed with ethyl acetate (2 mL) and dried for 16 h at 50° C. in vacuoto yield the title compound (37 mg, 3% of theory).

LC-MS (Method 1B): R_(t)=1.11 min, MS (ESIPos): m/z=447 [M+H]⁺

Example 36A Tert-butyl4-(10-iodo-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (0.750 g,2.50 mmol, 1.5 eq), 4-iodo-1H-indazol-3-ylamine (472 mg, 1.67 mmol, 1eq) and potassium phosphate (709 mg, 3.34 mmol, 2 eq) were suspended in1-methoxy-2-propanol (11 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The residue was purified by preparative HPLC (Method 1A). The combinedproduct fractions were evaporated in vacuo to remove acetonitrile. Theresulting suspension was filtered, the residue was washed with water (2ml) and dried for 16 h at 50° C. in vacuo to yield the title compound(56 mg, 7% of theory).

LC-MS (Method 1B): R_(t)=1.19 min, MS (ESIPos): m/z=495 [M+H]⁺

Example 37A Tert-butyl4-(8-bromo-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 6-bromo-1H-indazol-3-ylamine (472 mg, 2.27 mmol, 1eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) were suspended in1-methoxy-2-propanol (11 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The residue was purified by preparative HPLC (Method 1A). The combinedproduct fractions were evaporated in vacuo to remove acetonitrile. Theresulting suspension was filtered, the residue was washed with water (2ml) and dried for 16 h at 50° C. in vacuo to yield the title compound(94 mg, 9% of theory) as yellowish solid.

LC-MS (Method 1B): R_(t)=1.12 min, MS (ESIPos): m/z=447 [M+H]⁺

Example 38A Tert-butyl4-(7-chloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 7-chloro-1H-indazol-3-ylamine (373 mg, 2.27 mmol, 1eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) were suspended in1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and concentrated in vacuoto 5 mL. The resulting suspension was filtered, washed with ethylacetate (5 mL) and dried for 16 h at 50° C. in vacuo to yield the titlecompound (83 mg, 9% of theory).

LC-MS (Method 1B): R_(t)=1.09 min, MS (ESIPos): m/z=403 [M+H]⁺

Example 39A Tert-butyl 4-(8,10-difluoro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 4,6-difluoro-1H-indazol-3-ylamine (377 mg, 2.27mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The residue was purified by preparative HPLC (Method 1A). The combinedproduct fractions were evaporated in vacuo to remove acetonitrile. Theresulting suspension was filtered, the residue was washed with water (2ml) and dried for 16 h at 50° C. in vacuo to yield the title compound(27 mg, 90% purity, 3% of theory).

LC-MS (Method 2B): R_(t)=1.92 min, MS (ESIPos): m/z=405 [M+H]⁺

Example 40A Tert-butyl4-(8-methyl-4-oxo-1,4-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 6-methyl-1H-pyrazolo[3,4-b]pyridin-3-amine (330 mg,2.27 mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The residue was purified by preparative HPLC (Method 2A). The combinedproduct fractions were lyophilized to give the title compound (64 mg, 7%of theory).

LC-MS (Method 2B): R_(t)=1.64 min, MS (ESIPos): m/z=384 [M+H]⁺

Example 41A Tert-butyl4-(3-fluoro-9-oxo-9,10-dihydropyrido[3′,2′:3,4]pyrazolo[1,5-a]pyrimidin-7-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (932 mg,3.11 mmol, 1.5 eq), 6-fluoro-1H-pyrazolo[4,3-b]pyridin-3-amine (395 mg,80% purity, 2.07 mmol, 1 eq) and potassium phosphate (881 mg, 4.15 mmol,2 eq) were suspended in 1-methoxy-2-propanol (10 mL) in a 20 mLmicrowave vial. The vial was capped and the mixture was heated in amicrowave to 180° C. for 15 min. After cooling to RT, the suspension wasdiluted with 20 mL dichloromethane/methanol (4:1), filtered through ashort pad of silica gel with 100 mL dichloromethane/methanol (4:1) andevaporated in vacuo. The residue was purified by preparative HPLC(Method 1A). The combined product fractions were concentrated in vacuoto remove acetonitrile. The resulting suspension was filtered, theresidue was washed with water (2 ml) and dried for 16 h at 50° C. invacuo to give the title compound (59.2 mg, 95% purity, 7% of theory) asyellowish solid.

LC-MS (Method 1B): R_(t)=0.96 min, MS (ESIPos): m/z=388 [M+H]⁺

Example 42A Tert-butyl4-(10-ethoxy-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.07 g,3.58 mmol, 1.5 eq), 4-ethoxy-1H-indazol-3-amine (423 mg, 2.39 mmol, 1eq) and potassium phosphate (1.01 g, 4.78 mmol, 2 eq) were suspended in1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The residue was triturated with MTBE (15 mL), filtered, washed with MTBE(2 mL) and dried for 16 h at 50° C. in vacuo to yield the title compound(161 mg, 15% of theory).

LC-MS (Method 1B): R_(t)=1.11 min, MS (ESIPos): m/z=413 [M+H]⁺

Example 43A Tert-butyl4-(7-bromo-2-oxo-1,2-dihydropyrido[4′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 7-bromo-1H-pyrazolo[4,3-c]pyridin-3-amine (474 mg,2.27 mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (4:1), filtered through a short pad of silicagel with 100 mL dichloromethane/methanol (4:1) and evaporated in vacuo.The residue was triturated with acetonitrile (10 mL) and filtered. Theresidue was triturated with DMSO (6 mL), washed with acetonitrile (8 mL)and dried for 16 h at 50° C. in vacuo to yield the title compound (116mg, 12% of theory).

LC-MS (Method 1B): R_(t)=0.98 min, MS (ESIPos): m/z=448 [M+H]⁺

Example 44A Tert-butyl4-(7-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 7-fluoro-1H-indazol-3-amine (336 mg, 2.27 mmol, 1eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) were suspended in1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with water (20 mL) andneutralized (pH 6) by the addition of 1N HCl. The mixture was extractedwith ethyl acetate (2×30 mL). The combined organic phases were washedwith brine (10 mL), dried over sodium sulfate, filtered and evaporatedin vacuo. The residue was triturated with MTBE (5 mL), filtered andwashed with MTBE (2 mL). The residue was purified by preparative HPLC(Method 1A). The combined product fractions were evaporated in vacuo toremove acetonitrile. The resulting suspension was filtered, the residuewas washed with water (2 ml) and dried for 2 h at 50° C. in vacuo to thetitle compound (92 mg, 11% of theory) as off-white solid.

LC-MS (Method 1B): R_(t)=1.03 min, MS (ESIPos): m/z=387 [M+H]⁺

Example 45A Tert-butyl4-(2-oxo-1,2-dihydropyrido[3′,4′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 1H-pyrazolo[3,4-c]pyridin-3-amine (299 mg, 2.27mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the suspension was diluted with water (20mL) and neutralized (pH 7) by the addition of 1N HCl. The precipitatewas filtered, washed with water (10 mL) and dried for 16 h at 50° C. invacuo to yield the title compound (169 mg, 75% purity, 16% of theory).

LC-MS (Method 1B): R_(t)=0.73 min, MS (ESIPos): m/z=370 [M+H]⁺

Example 46A Tert-butyl4-[2-oxo-7-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 7-(trifluoromethyl)-1H-indazol-3-amine (299 mg, 2.27mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the suspension was diluted with water (20mL), neutralized (pH 6) by the addition of 1N HCl and extracted withethyl acetate (2×50 mL). The combined organic phases were washed withwater (30 mL), brine (30 mL), dried over magnesium sulfate, filtered andevaporated in vacuo. The residue was triturated with MTBE (5 mL),filtered, washed with MTBE (2 mL)) and dried for 16 h at 50° C. in vacuoto yield the title compound (122 mg, 12% of theory).

LC-MS (Method 1B): R_(t)=1.16 min, MS (ESIPos): m/z=437 [M+H]⁺

Example 47A Tert-butyl4-[10-nitro-2-oxo-8-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 4-nitro-6-(trifluoromethyl)-1H-indazol-3-amine (548mg, 2.23 mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq)were suspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwavevial. The vial was capped and the mixture was heated in a microwave to180° C. for 15 min. After cooling to RT, the suspension was diluted with20 mL dichloromethane/methanol (4:1), filtered through a short pad ofsilica gel with 100 mL dichloromethane/methanol (4:1) and evaporated invacuo. The residue was purified by preparative HPLC (Method 1A). Thecombined product fractions were concentrated in vacuo to removeacetonitrile. The resulting suspension was filtered, the residue waswashed with water (2 ml) and dried for 16 h at 50° C. in vacuo to givethe title compound (90.8 mg, 8% of theory).

LC-MS (Method 1B): R_(t)=1.16 min, MS (ESIPos): m/z=482 [M+H]⁺

Example 48A Tert-butyl 4-(8,10-dimethyl-4-oxo-1,4-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 4,6-Dimethyl-1H-pyrazolo[3,4-b]pyridin-3-amine (361mg, 2.27 mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq)were suspended in 1-methoxy-2-propanol (9 mL) in a 20 mL microwave vial.The vial was capped and the mixture was heated in a microwave to 180° C.for 15 min. After cooling to RT, the suspension was diluted with water(50 mL), neutralized (pH 5-6) by the addition of 1N HCl and extractedwith ethyl acetate (2×100 mL). The combined organic phases were washedwith water, (2×25 mL), brine (25 mL), dried over sodium sulfate,filtered and evaporated in vacuo. The residue was triturated withacetonitrile (4 mL) and DMSO (4 mL). The precipitate was filtered,washed with acetonitrile (2×2 mL) and dried for 2 h at 50° C. in vacuoto yield the title compound (50 mg, 5% of theory) as yellow solid.

LC-MS (Method 1B): R_(t)=0.92 min, MS (ESIPos): m/z=398 [M+H]⁺

Example 49A Tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)-2-methylpiperidine-1-carboxylate[Enantiomerically Pure Trans-Isomer]

The title compound was prepared according to General Procedure 1Astarting from 0.92 g (5.13 mmol) 4-chloro-1H-indazol-3-amine and 2.02 g(5.13 mmol) (−)-cis-tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]-2-methylpiperidine-1-carboxylate.Then the mixture was evaporated and the crude product was treated HCl 1Nand extracted with ethyl acetates several times. The organic layer waswashed with water and dried over sodium sulfate, filtered, evaporatedand dried under vacuo. The crude product was stirred in acetonitrile andthen was filtered and dried under vacuo to yield the title compound as amixture of two diastereoisomers (950 mg, 100% of theory). The mixturewas dissolved in methanol (6.6 ml) and then was treated with HCl 4N indioxane (6.6 ml). The reaction mixture was sonicated at RT for 15minutes. The solvent was evaporated under vacuo and the crude productwas stirred in methanol. The resulting solid was filtered, washed withdioxane and dried under vacuo to yield a crude product with the twodeprotected diastereomers (677 mg) which could not be separated fromeach other through chromatography. For this reason the crude product wasdissolved again in dichloromethane (15 ml) and was treated withdi-tert-butyl dicarbonate (0.38 g, 1.78 mmol) and triethylamine (0.18 g,1.77 mol). The reaction mixture was stirred 15 minutes at RT and wasleft without stirring at RT for 39 h. Then the solvent was evaporatedunder vacuo and the crude product was treated with water and extractedseveral times with ethyl acetate. The collected organic phases werewashed with an 10% aq. solution of citric acid, with water and brine.After that the organic layer was dried over sodium sulfate, filtered,evaporated and dried under vacuo. At that point the mixture could beseparated by Method 4C to yield the title compound (273 mg, 37% oftheory).

LC-MS (Method 1B): RT=1.18 min, MS (ESIPos): m/z=417 (M+H)⁺

HPLC (Method 4E): R_(t)=8.77 min

Example 50A Tert-butyl4-(7-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)-2-methylpiperidine-1-carboxylate(750 mg, 2.50 mmol, 1.5 eq), 7-bromo-1H-indazol-3-amine (354 mg, 1.67mmol, 1 eq) and potassium phosphate (709 mg, 3.34 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the suspension was diluted with water (20mL) and neutralized (pH 6-7) by the addition of 1N HCl. The resultingaqueous suspension filtered, the residue was washed with ethyl acetate(10 mL) and acetonitrile (5 mL) and dried for 16 h at 50° C. in vacuo togive the title compound (42.3 mg, 7% of theory).

LC-MS (Method 1B): R_(t)=1.12 min, MS (ESIPos): m/z=447 [M+H]⁺

Example 51A Tert-butyl4-(2-oxo-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol, 1.5 eq), 1H-Pyrazolo[3,4-b]pyridin-3-amine (299 mg, 2.27mmol, 1 eq) and potassium phosphate (945 mg, 4.45 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the mixture was diluted with water (20 mL)and acidified (pH 5) by the addition of 1N HCl. The resulting suspensionwas filtered, washed with water (20 mL) and the residue was purified bypreparative HPLC (Method 2A). The combined product fractions werelyophilized to give the title compound (36.3 mg, 4% of theory).

LC-MS (Method 1B): R_(t)=0.78 min, MS (ESIPos): m/z=370 [M+H]⁺

Example 52A Tert-butyl4-(10-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (750 mg,2.50 mmol, 1.5 eq), 4-methyl-1H-indazol-3-amine (246 mg, 1.67 mmol, 1eq) and potassium phosphate (709 mg, 3.34 mmol, 2 eq) were suspended in1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the suspension was diluted with water (20 mL),neutralized (pH 6) by the addition of 1N HCl and extracted with ethylacetate (2×30 mL). The combined organic phases were washed with water,(50 mL), brine (25 mL), dried over magnesium sulfate, filtered andevaporated in vacuo. The residue was purified by preparative HPLC(Method 1A). The combined product fractions were concentrated in vacuoto remove acetonitrile. The resulting suspension was filtered, theresidue was washed with water (2 ml) and dried for 16 h at 50° C. invacuo to give the title compound (63.8 mg, 10% of theory).

LC-MS (Method 1B): R_(t)=1.07 min, MS (ESIPos): m/z=383 [M+H]⁺

Example 53A Tert-butyl4-[2-oxo-10-(trifluoromethoxy)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (750 mg,2.50 mmol, 1.5 eq), 4-(trifluoromethoxy)-1H-indazol-3-amine (363 mg,1.67 mmol, 1 eq) and potassium phosphate (709 mg, 3.34 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the suspension was diluted with water (20mL), neutralized (pH 6) by the addition of 1N HCl and extracted withethyl acetate (2×30 mL). The combined organic phases were washed withwater, (50 mL), brine (25 mL), dried over magnesium sulfate, filteredand evaporated in vacuo. The residue was purified by preparative HPLC(Method 1A). The combined product fractions were concentrated in vacuoto remove acetonitrile. The resulting suspension was filtered, theresidue was washed with water (2 ml) and dried for 16 h at 50° C. invacuo to give the title compound (64 mg, 8% of theory) as off-whitesolid.

LC-MS (Method 2B): R_(t)=2.51 min, MS (ESIPos): m/z=453 [M+H]⁺

Example 54A Tert-butyl4-(9-oxo-9,10-dihydropyrazino[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-7-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (750 mg,2.50 mmol, 1.5 eq), 1H-pyrazolo[3,4-b]pyrazin-3-amine (226 mg, 1.67mmol, 1 eq) and potassium phosphate (709 g, 3.34 mmol, 2 eq) weresuspended in 1-methoxy-2-propanol (10 mL) in a 20 mL microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the suspension was diluted with 20 mLdichloromethane/methanol (3:1), filtered through a short pad of silicagel with 150 mL dichloromethane/methanol (3:1) and evaporated in vacuo.The residue was purified by preparative HPLC (Method 1A). The combinedproduct fractions were lyophilized to give the title compound (31.1 mg,5% of theory) as yellow solid.

LC-MS (Method 1B): R_(t)=0.85 min, MS (ESIPos): m/z=371 [M+H]⁺

Example 55A Tert-butyl4-(8-chloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (450 mg,81% purity, 1.22 mmol, 1 eq), 6-chloro-1H-indazol-3-amine (204 mg, 1.22mmol, 1.0 eq) and potassium phosphate (517 mg, 2.43 mmol, 2 eq) weresuspended in dioxane (4.3 mL) in a 20 mL microwave vial. The vial wascapped and the mixture was heated in a microwave to 150° C. for 1 h. Thesolvent was evaporated in vacuo, the residue was diluted with water (20mL) and extracted with ethyl acetate (2×, 50 mL and 25 mL). The combinedorganic phases were dried over sodium sulfate, filtered and evaporatedin vacuo. The residue was purified by preparative HPLC (Method 2A). Thecombined product fractions were evaporated in vacuo. The residue waspurified again by preparative HPLC (Method 1A). The combined productfractions were neutralized with aqueous ammonium hydroxide andacetonitrile was evaporated in vacuo. The aqueous phase was extractedwith ethyl acetate (30 mL), dried over sodium sulfate, filtered andevaporated in vacuo to yield the title compound (5.2 mg, 1% of theory).

LC-MS (Method 1B): R_(t)=1.13 min, MS (ESIPos): m/z=403 [M+H]⁺

Example 56A N⁴,N⁴-Dimethyl-1H-pyrazolo[3,4-b]pyridine-3,4-diamine

2-Chloro-4-(dimethylamino)nicotinonitrile (500 mg, 2.75 mmol) and sodiumacetate (270 mg, 3.30 mmol) were suspended in pyridine (4 ml) underargon atmosphere. The resulting suspension was heated at 100° C.Hydrazine hydrate (1.38 g, 27.53 mmol) was added slowly over a period of10 minutes and then the reaction mixture was heated at 115° C. for 2 h.After cooling to RT the mixture was diluted in water and was extractedwith dichlormethane. The collected organic phases were washed withbrine, dried over magnesium sulfate, filtered and evaporated. Theresidue was dried under vacuo to yield the title compound (303 mg, 57%of theory).

LC-MS (Method 2B): R_(t)=1.37 min, MS (ESIPos): m/z=177 [M+H]⁺

Example 57A 4-Chloro-6-(trifluoromethyl)-1H-indazol-3-amine

2,6-Dichloro-4-(trifluoromethyl)benzonitrile (500 mg, 2.08 mmol) andsodium acetate (205 mg, 2.50 mmol) were suspended in pyridine (5 ml)under argon atmosphere. The resulting suspension was heated at 95° C.Hydrazine hydrate (1.04 g, 20.83 mmol) was added slowly over a period of10 minutes and then the reaction mixture was heated at 115° C. for 2 h.After cooling to RT, the mixture was diluted in water and it wasacidified by addition of HCl 4N until pH 6 was achieved. The mixture wasextracted with ethyl acetate and the collected organic phases werewashed water and brine, dried over magnesium sulfate, filtered andevaporated. The residue was dried under vacuo to yield the titlecompound (0.54 g, 99% of theory).

LC-MS (Method 1B): R_(t)=0.90 min, MS (ESIPos): m/z=236 [M+H]⁺

Example 58A6-(4-Fluorophenyl)-4-(trifluoromethyl)-1H-pyrazolo[3,4-b]pyridin-3-amine

To a solution of2-chloro-6-(4-fluorophenyl)-4-(trifluoromethyl)nicotinonitrile (0.40 g,1.33 mmol) in ethanol (4 ml) under argon atmosphere was added hydrazinehydrate (0.13 g, 2.66 mmol) at RT. The mixture was heated at 70° C. for15 h. After cooling to RT, water was added and the resulting precipitatewas filtered, washed again with water and dried under vacuo 2 h at 50°C. to yield the title compound (0.36 g, 89% of theory).

LC-MS (Method 1B): R_(t)=0.99 min, MS (ESIPos): m/z=297 [M+H]⁺

Example 59A 4-Methyl-1H-pyrazolo[3,4-b]pyridin-3-amine

2-Chloro-4-methylnicotinonitrile (500 mg, 3.18 mmol) and sodium acetate(312 mg, 3.81 mmol) were suspended in pyridine (7.5 ml) under argonatmosphere. The resulting suspension was heated at 100° C. Hydrazinehydrate (1.62 g, 31.79 mmol) was added slowly over a period of 10minutes and then the resulting mixture was heated at 105° C. for 5 h.After cooling to RT the mixture was diluted in water and acidified byaddition of HCl 1N until pH 6 was achieved. The mixture was extractedwith dichloromethane and the collected organic phases were washed withwater and brine, dried over sodium sulfate, filtered and evaporated. Theresidue was dried under vacuo to yield the title compound (0.27 g, 59%of theory).

LC-MS (Method 2B): R_(t)=1.21 min, MS (ESIPos): m/z=149 [M+H]⁺

Example 60A 1H-Pyrazolo[4,3-c]pyridin-3-amine

To a solution of 4-chloronicotinonitrile (1.00 g, 7.00 mmol) in ethanol(10 ml) under argon atmosphere was added hydrazine hydrate (0.71 g,14.00 mmol) at RT. The mixture was heated to 70° C. for 5 h. Aftercooling to RT the mixture was diluted with water and extracted withethyl acetate. In the aqueous phase a pale-yellow solid precipitatedwhich was collected by filtration and dried under vacuo to yield thetitle compound (0.43 g, 46% of theory).

LC-MS (Method 2B): R_(t)=0.49 min, MS (ESIPos): m/z=135 [M+H]⁺

Example 61A 6-Phenyl-1H-pyrazolo[3,4-b]pyridin-3-amine

To a solution of 2-chloro-6-phenylnicotinonitrile (1.00 g, 4.66 mmol) inethanol (10 ml) under argon atmosphere was added hydrazine hydrate (0.48g, 9.32 mmol) at RT. The mixture was heated at 70° C. for 15 h. Afterthat time (0.23 g, 4.65 mmol) hydrazine hydrate were added into themixture and it was still stirred 2 h at 70° C. After cooling to RT themixture was diluted with water and the resulting precipitate wasfiltered, washed with water and dried under vacuo to yield the titlecompound (0.83 g, 84% of theory).

LC-MS (Method 1B): R_(t)=0.69 min, MS (ESIPos): m/z=210 [M+H]⁺

Example 62A 4-Phenyl-1H-pyrazolo[3,4-b]pyridin-3-amine

To a solution of 2-chloro-4-phenylnicotinonitrile (1.00 g, 4.43 mmol) inethanol (9.5 ml) under argon atmosphere was added hydrazine hydrate(0.45 g, 8.85 mmol) at RT. The mixture was heated at 70° C. for 15 h.After that time (0.11 g, 2.21 mmol) hydrazine hydrate were added intothe mixture and it was still stirred at 70° C. for 2 h. After cooling toRT the mixture was diluted with water and the resulting precipitate wasfiltered, washed with water and dried under vacuo to yield the titlecompound (0.83 g, 89% of theory).

LC-MS (Method 1B): R_(t)=0.67 min, MS (ESIPos): m/z=210 [M+H]⁺

Example 63A 5-Phenyl-1H-pyrazolo[3,4-b]pyridin-3-amine

To a solution of 2-chloro-5-phenylnicotinonitrile (1.00 g, 4.66 mmol) inethanol (10 ml) under argon atmosphere was added hydrazine hydrate (0.48g, 9.32 mmol) at RT. The mixture was heated at 70° C. for 15 h. Aftercooling to RT the mixture was diluted with water and the resultingprecipitate was filtered, washed with water and dried under vacuo toyield the title compound (0.88 g, 89% of theory).

LC-MS (Method 1B): R_(t)=0.68 min; MS (ESIPos): m/z=210 [M+H]⁺

Example 64A Tert-butyl4-[10-(dimethylamino)-2-oxo-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl]piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (842 mg,2.33 mmol), N⁴,N⁴-dimethyl-1H-pyrazolo[3,4-b]pyridine-3,4-diamine (303mg, 1.56 mmol) and potassium phosphate (661 mg, 3.11 mmol) weresuspended in 1-methoxy-2-propanol (7 ml) in a 20 ml microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After cooling to RT, the solvent was evaporated and the residuewas diluted in water and extracted with ethyl acetate. After separationof the two layers, the aqueous layer was extracted with ethyl acetate.The aqueous layer was acidified with HCl 1N until pH 7 was achieved andthen evaporated under vacuo. The crude product was purified bypreparative HPLC (Method 1A). The combined product fractions wereneutralized with a 33% ammonia solution and then acetonitrile wasevaporated. The resulting aqueous phase was extracted with ethyl acetateand the collected organic phases were dried over sodium sulfate,filtrated and evaporated. The resulting solid was dried under vacuo toyield the title compound (11 mg, 2% of theory).

LC-MS (Method 1B): R_(t)=0.77 min, MS (ESIPos): m/z=413 [M+H]⁺

Example 65A Tert-butyl4-[10-chloro-2-oxo-8-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.03 g,2.87 mmol), 4-chloro-6-(trifluoromethyl)-1H-indazol-3-amine (500 mg,1.91 mmol) and potassium phosphate (811 mg, 3.82 mmol) were suspended in1-methoxy-2-propanol (9 ml) in a 20 ml microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the solvent was evaporated and the residue wasdiluted with water and extracted with ethyl acetate. After separation ofthe layers the aqueous layer was extracted with ethyl acetate. Thecollected organic layers were dried over magnesium sulfate, filtratedand evaporated. The crude product was purified by preparative (Method1A). The combined product fractions were neutralized with a 33% ammoniasolution and then acetonitrile was evaporated. The resulting solid inthe aqueous phase was filtered and dried under vacuo to yield the titlecompound (287 mg, 32% of theory).

LC-MS (Method 1B): R_(t)=1.27 min, MS (ESIPos): m/z=471 [M+H]⁺

Example 66A Tert-butyl4-[8-(4-fluorophenyl)-2-oxo-10-(trifluoromethyl)-1,2-dihydropyrido[2′3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl]piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (630 mg,1.75 mmol),6-(4-fluorophenyl)-4-(trifluoromethyl)-1H-pyrazolo[3,4-b]pyridin-3-amine(352 mg, 1.17 mmol) and potassium phosphate (494 mg, 2.33 mmol) weresuspended in 1-methoxy-2-propanol (10 ml) in a 20 ml microwave vial. Thevial was capped and the mixture was heated in a microwave to 180° C. for15 min. After this period the mixture was additionally heated in the MWat 180° C. for 30 min. After cooling to RT, the solvent was evaporatedand the residue was diluted in water and extracted with ethyl acetate.After separation of the layers the aqueous layer was extracted withethyl acetate. The collected organic layers were dried over sodiumsulfate, filtered and evaporated. The crude product was purified bypreparative HPLC (Method 1A). The combined product fractions wereneutralized with a 33% ammonia solution and then acetonitrile wasevaporated. The resulting solid in the aqueous phase was filtered anddried under vacuo to yield the title compound (62 mg, 10% of theory).

LC-MS (Method 1B): R_(t)=1.29 min, MS (ESIPos): m/z=532 [M+H]⁺

Example 67A Tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrido[3′,4′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,3.34 mmol), 4-bromo-1H-pyrazolo[3,4-c]pyridin-3-amine (474 mg, 2.23mmol) and potassium phosphate (945 mg, 4.45 mmol) were suspended in1-methoxy-2-propanol (10 ml) in a 20 ml microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the mixture was diluted with water and neutralizeduntil pH 6 was achieved by the addition of 1N HCl. The resulting solidwas filtrated, washed with ethyl acetate and dried under vacuo at 60° C.overnight to yield the first fraction of title compound. Afterseparation of filtrate layers the aqueous layer was extracted with ethylacetate. The collected organic layers were washed with water and brinesolution. The resulting precipitate formed in the organic phase wasfiltered and dried under vacuo at 60° C. for 2 h to give a secondfraction of the title compound. Overall yield (176 mg, 18% of theory).

LC-MS (Method 1B): R_(t)=0.98 min, MS (ESIPos): m/z=450 [M+H]⁺

Example 68A Tert-butyl4-(2-oxo-8-phenyl-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1.00 g,2.77 mmol), 6-phenyl-1H-pyrazolo[3,4-b]pyridin-3-amine (393 mg, 1.85mmol) and potassium phosphate (785 mg, 3.70 mmol) were suspended in1-methoxy-2-propanol (10 ml) in a 20 ml microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the reaction mixture was diluted with water andneutralized (pH 6) by the addition of 1N HCl. The resulting solid wasfiltrated, washed with ethyl acetate and dried under vacuo. The solidwas stirred in a mixture of DMSO/water, filtered and dried under vacuoto yield a first fraction of title compound. The filtrate was purifiedby preparative HPLC (Method 2A) to yield a second fraction of the titlecompound. Overall yield: 112 mg, 14%.

LC-MS (Method 1B): R_(t)=1.07 min, MS (ESIPos): m/z=446 [M+H]⁺

Example 69A Tert-butyl4-(2-oxo-9-phenyl-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1 g,2.77 mmol), 5-phenyl-1H-pyrazolo[3,4-b]pyridin-3-amine (389 mg, 1.85mmol) and potassium phosphate (785 mg, 3.70 mmol) were suspended in1-methoxy-2-propanol (10 ml) in a 20 ml microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the reaction mixture was diluted with water andneutralized (pH 6) by the addition of 1N HCl. The resulting solid wasfiltrated, washed with ethyl acetate and water and dried under vacuo.The solid was stirred in a mixture of water and DMSO, filtered and driedunder vacuo. The solid was stirred again in a mixture of water, ammoniaand acetonitrile. The resulting solid was filtered and the filtrate waspurified by preparative HPLC Method 2A) to yield the title compound (70mg, 8% of theory).

LC-MS (Method 1B): R_(t)=1.02 min, MS (ESIPos): m/z=446 [M+H]⁺

Example 70A Tert-butyl4-(2-oxo-10-phenyl-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1 g,2.77 mmol), 4-phenyl-1H-pyrazolo[3,4-b]pyridin-3-amine (389 mg, 1.85mmol) and potassium phosphate (785 mg, 3.70 mmol) were suspended in1-methoxy-2-propanol (10 ml) in a 20 ml microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.After cooling to RT, the reaction mixture was diluted with water andneutralized (pH 6) by the addition of 1N HCl. The resulting solid wasfiltrated, washed with ethyl acetate and water and dried under vacuo.The solid was stirred in a mixture of water, ammonia and acetonitrile.The solid was filtered off and the filtrate was purified by preparativeHPLC (Method 2A) to yield the title compound (49 mg, 6% of theory).

LC-MS (Method 1B): R_(t)=0.98 min, MS (ESIPos): m/z=446 [M+H]⁺

Example 71A Tert-butyl4-(2-oxo-1,2-dihydropyrido[4′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

The title compound was prepared according to General Procedure 1Astarting from 37 mg (0.28 mmol) 1H-pyrazolo[4,3-c]pyridin-3-amine and100 mg (0.28 mmol) tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate.

Work-up: the mixture was diluted with ethyl acetate and treated with HCl1H. The layers were separated and the aqueous layer was treated withNaOH 1N until pH 10 was achieved. The resulting precipitate was filteredand dried under vacuo to yield the title compound (13 mg, 12% oftheory).

LC-MS (Method 1B): R_(t)=0.68 min, MS (ESIPos): m/z=370 [M+H]⁺

Example 72A Tert-butyl4-(10-methyl-2-oxo-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (818 mg,2.27 mmol), 4-methyl-1H-pyrazolo[3,4-b]pyridin-3-amine (224 mg, 1.51mmol) and potassium phosphate (642 mg, 3.02 mmol) were suspended in1-methoxy-2-propanol (8 ml) in a 20 ml microwave vial. The vial wascapped and the mixture was heated in a microwave to 180° C. for 15 min.The reaction mixture was diluted with water and neutralized (pH 6) bythe addition of 1N HCl. The resulting solid was filtrated, washed withethyl acetate and water and dried under vacuo. The solid was stirred ina mixture of water, ammonia and acetonitrile. The solid was filtered offand the filtrate was purified by preparative HPLC (Method 2A) to yieldthe title compound (40 mg, 7% of theory).

LC-MS (Method 3B): R_(t)=1.75 min, MS (ESIPos): m/z=384 [M+H]⁺

Example 73A Tert-butyl4-(9-iodo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Tert-butyl 4-(3-ethoxy-3-oxopropanoyl)piperidine-1-carboxylate (1 g,2.27 mmol), 5-iodo-1H-indazol-3-amine (504 mg, 1.85 mmol) and potassiumphosphate (785 mg, 3.70 mmol) were suspended in 1-methoxy-2-propanol (10ml) in a 20 ml microwave vial. The vial was capped and the mixture washeated in a microwave to 180° C. for 15 min. After cooling to RT theresidue was diluted with water and extracted with ethyl. The layers wereseparated and the aqueous layer was extracted with ethyl acetate. Thecollected organic phases were dried over magnesium sulfate, filtered andevaporated. The crude product was purified by preparative HPLC (Method1A). The combined product fractions were neutralized with aqueousammonium hydroxide. After the evaporation of acetonitrile a white solidwas formed in the aqueous phase, which was filtered and dried undervacuo to yield the title compound (108 mg, 12% of theory).

LC-MS (Method 3B): R_(t)=2.46 min, MS (ESIPos): m/z=495 [M+H]⁺

Example 74ATert-butyl-4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)-2-methylpiperidine-1-carboxylate[Enantiomerically Pure Trans-Isomer]

The title compound was prepared according to General Procedure 1Astarting from 1.00 g (4.48 mmol) 4-bromo-1H-indazol-3-amine and 1.77 mg(4.48 mmol) (−)-cis-tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]-2-methylpiperidine-1-carboxylate.

Work-up: the mixture was evaporated and the crude product was treatedwith water and ethyl acetate. After separation of the layers the organiclayer was washed with water, dried over sodium sulfate and evaporatedunder vacuo. The crude product was purified by preparative HPLC (Method1A). The combined product fractions were neutralized with a 33% ammoniasolution and then acetonitrile was evaporated. In the aqueous phaseprecipitated a solid which was filtered and dried under vacuo. Afterreaction epimerization was observed obtaining a mixture of diastereomerswhich were separated by Method 1C to yield the title compound (1.00 g,49% of theory).

LC-MS (Method 1B): R_(t)=1.17 min, MS (ESIPos): m/z=463 [M+H]⁺

HPLC (Method 1E): R_(t)=7.04 min

Example 75A Tert-butyl4-(10-ethoxy-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)-2-methylpiperidine-1-carboxylate[Enantiomerically Pure Trans-Isomer]

The title compound was prepared according to General Procedure 1Astarting from 0.26 g (1.28 mmol)4-Ethoxy-1H-pyrazolo[3,4-b]pyridin-3-amine and 0.50 g (1.28 mmol)(−)-cis-tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]-2-methylpiperidine-1-carboxylate.

Work-up: the mixture was evaporated and the crude product was treatedwith water and ethyl acetate. After separation of the layers the aqueouslayer was extracted with ethyl acetate and then the collected organicphases were washed with water, dried over sodium sulfate and evaporatedunder vacuo. The crude product was sonicated 15 minutes at RT intert-butylmethylether, filtered off and the filtrate was evaporated andthen purified by preparative HPLC (Method 1A). The combined productfractions were neutralized with a 33% ammonia solution and thenacetonitrile was evaporated. In the aqueous phase precipitated a solidwhich was filtered and dried under vacuo. After reaction epimerizationwas observed obtaining a mixture of diastereomers which were separatedby Method 2C to yield the title compound (99 mg, 18% of theory).

LC-MS (Method 2B): R_(t)=2.45 min, MS (ESIPos): m/z=427 [M+H]⁺

HPLC (Method 2E): R_(t)=5.75 min

Example 76A Tert-butyl2-methyl-4-(2-oxo-10-phenyl-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate[Enantiomerically Pure Trans-Isomer]

The title compound was prepared according to General Procedure 1Astarting from 200 mg (0.92 mmol)4-phenyl-1H-pyrazolo[3,4-b]pyridin-3-amine and 363 mg (0.92 mmol)(−)-cis-tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]-2-methylpiperidine-1-carboxylate.

Work-up: the mixture was evaporated and the crude product was treatedwith water and extracted with ethyl acetate. After separation of thephases a yellow solid precipitated in the aqueous phase. The solid wasfiltered and dried under vacuo. After reaction epimerization wasobserved obtaining a mixture of diastereomers which were separated byMethod 3C. The fraction containing the title compound was purified againby preparative HPLC (Method 1A). The combined product fractions wereneutralized with a 33% ammonia solution and then acetonitrile wasevaporated. In the aqueous phase precipitated a solid which was filteredand dried under vacuo to yield the title compound (81 mg, 20% oftheory).

LC-MS (Method 1B): R_(t)=1.04 min, MS (ESIPos): m/z=460 [M+H]⁺

HPLC (Method 3E): R_(t)=8.18 min

Example 77A 3-Amino-1H-indazole-4-carbonitrile

3-Fluorophthalonitrile (1.00 g, 6.84 mmol) was dissolved in ethanol (10mL) and treated with hydrazine hydrate (1.37 g, 27.4 mmol). Afterstirring at 70° C. for 8 h, the mixture was cooled to RT andconcentrated in vacuo. The residue was dissolved in a mixture of waterand ethyl acetate. The aqueous layer was extracted once more with ethylacetate. The combined organic layers were washed with water and withbrine, dried over magnesium sulfate, concentrated in vacuo and dried toyield the title compound (0.51 g, 47% of theory)

LC-MS (Method 2B): R_(t)=1.47 min, MS (ESIPos): m/z=159 [M+H]⁺

Example 78A Tert-butyl4-(10-cyano-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

3-Amino-1H-indazole-4-carbonitrile (0.51 g, 3.20 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(1.27 g, 3.55 mmol) were dissolved in acetonitrile (20 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (20 mL). Potassiumphosphate (1.37 g, 6.45 mmol) was added and the mixture was stirred at80° C. for 6 h. Concentration in vacuo and purification by preparativeHPLC (Method 1A) afforded the title compound (0.32 g, 25% of theory).

LC-MS (Method 1B): R_(t)=1.07 min, MS (ESIPos): m/z=394 [M+H]⁺

Example 79A 4-(4-Methoxyphenyl)-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),4-methoxyphenylboronic acid (0.68 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.07 g, 0.09mmol) were dissolved in a degassed mixture of ethanol, water, andtoluene (1:1:1, 20 mL total volume). Potassium phosphate solution (1 Min water, degassed) (6.00 mL, 6.00 mmol) was added and the mixture wasstirred at 80° C. for 4 h. The mixture was concentrated in vacuo andpurified by preparative HPLC (Method 1A) to yield the title compound(0.28 g, 40% of theory).

LC-MS (Method 1B): R_(t)=0.84 min, MS (ESIPos): m/z=240 [M+H]⁺

Example 80ATert-butyl-4-[10-(4-methoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidin-1-carboxylate

4-(4-Methoxyphenyl)-1H-indazol-3-amine (0.28 g, 1.18 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.46 g, 1.30 mmol) were dissolved in acetonitrile (10 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (10 mL). Potassiumphosphate (0.52 g, 2.44 mmol) was added and the mixture was stirred at120° C. for 6 h. Concentration in vacuo and purification by preparativeHPLC (Method 1A) afforded the title compound (0.31 g, 54% of theory).

LC-MS (Method 1B): R_(t)=1.27 min, MS (ESIPos): m/z=475 [M+H]⁺

Example 81A 4-[4-(Trifluoromethyl)phenyl]-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),4-trifluoromethylphenylboronic acid (0.85 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (0.07 g, 0.09 mmol) were dissolved in a degassedmixture of ethanol, water, and toluene (1:1:1, 20 mL total volume).Potassium phosphate solution (1 M in water, degassed) (6.00 mL, 6.00mmol) was added and the mixture was stirred at 80° C. for 4 h. Themixture was concentrated in vacuo and purified by preparative HPLC(Method 1A) to yield the title compound (0.18 g, 22% of theory).

LC-MS (Method 1B): R_(t)=0.99 min, MS (ESIPos): m/z=278 [M+H]⁺

Example 82A Tert-butyl4-{2-oxo-10-[4-(trifluoromethyl)phenyl]-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate

4-[4-(Trifluoromethyl)phenyl]-1H-indazol-3-amine (0.18 g, 0.65 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.25 g, 0.71 mmol) were dissolved in acetonitrile (5 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (10 mL). Potassiumphosphate (0.29 g, 1.36 mmol) was added and the mixture was stirred at120° C. for 6 h. Concentration in vacuo and purification by preparativeHPLC (Method 1A) afforded the title compound (0.18 g, 53% of theory).

LC-MS (Method 1B): R_(t)=1.38 min, MS (ESIPos): m/z=513 [M+H]⁺

Example 83A 4-Phenyl-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),phenylboronic acid (0.55 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.07 g, 0.09mmol) were dissolved in a degassed mixture of ethanol, water, andtoluene (1:1:1, 20 mL total volume). Potassium phosphate solution (1 Min water, degassed) (6.00 mL, 6.00 mmol) was added and the mixture wasstirred at 80° C. for 4 h. The mixture was concentrated in vacuo andpurified by preparative HPLC (Method 1A) to yield the title compound(0.35 g, 57% of theory).

LC-MS (Method 1B): R_(t)=0.83 min, MS (ESIPos): m/z=210 [M+H]⁺

Example 84A Tert-butyl4-(2-oxo-10-phenyl-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Phenyl-1H-indazol-3-amine (0.35 g, 1.69 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.66 g, 1.86 mmol) were dissolved in acetonitrile (10 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (10 mL). Potassiumphosphate (0.75 g, 3.55 mmol) was added and the mixture was stirred at120° C. for 6 h. Concentration in vacuo and purification by preparativeHPLC (Method 1A) afforded the title compound (0.47 g, 60% of theory).

LC-MS (Method 1B): R_(t)=1.23 min, MS (ESIPos): m/z=445 [M+H]⁺

Example 85A 4-(2-Fluorophenyl)-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),2-fluorophenylboronic acid (0.63 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.07 g, 0.09mmol) were dissolved in a degassed mixture of ethanol, water, andtoluene (1:1:1, 20 mL total volume). Potassium phosphate solution (1 Min water, degassed) (6.00 mL, 6.00 mmol) was added and the mixture wasstirred at 80° C. for 4 h. The mixture was concentrated in vacuo andpurified by preparative HPLC (Method 1A) to yield the title compound(0.45 g, 66% of theory).

LC-MS (Method 2B): R_(t)=2.07 min, MS (ESIPos): m/z=228 [M+H]⁺

Example 86A Tert-butyl4-[10-(2-fluorophenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(2-Fluorophenyl)-1H-indazol-3-amine (0.45 g, 1.97 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.77 g, 2.17 mmol) were dissolved in acetonitrile (10 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (10 mL). Potassiumphosphate (0.98 g, 4.60 mmol) was added and the mixture was stirred at120° C. for 6 h. Concentration in vacuo and purification by preparativeHPLC (Method 1A) afforded the title compound (0.59 g, 55% of theory).

LC-MS (Method 3B): R_(t)=2.62 min, MS (ESIPos): m/z=463[M+H]⁺

Example 87A 4-(Pyridin-3-yl)-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),3-pyridylboronic acid (0.55 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.07 g, 0.09mmol) were dissolved in a degassed mixture of ethanol, water, andtoluene (1:1:1, 20 mL total volume). Potassium phosphate solution (1 Min water, degassed) (6.00 mL, 6.00 mmol) was added and the mixture wasstirred at 80° C. for 4 h. The mixture was concentrated in vacuo andpurified by preparative HPLC (Method 1A) to yield the title compound(0.48 g, 77% of theory).

LC-MS (Method 2B): R_(t)=1.63 min, MS (ESIPos): m/z=211 [M+H]⁺

Example 88A Tert-butyl4-[2-oxo-10-(pyridin-3-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(Pyridin-3-yl)-1H-indazol-3-amine (0.48 g, 2.28 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.89 g, 2.51 mmol) were dissolved in acetonitrile (20 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (30 mL). Potassiumphosphate (0.97 g, 4.56 mmol) was added and the mixture was stirredunder reflux for 6 h. Concentration in vacuo and purification bypreparative HPLC (Method 1A) afforded the title compound (0.48 g, 47% oftheory).

Example 89A 4-(Pyridin-4-yl)-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),4-pyridylboronic acid (0.55 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.07 g, 0.09mmol) were dissolved in a degassed mixture of ethanol, water, andtoluene (1:1:1, 20 mL total volume). Potassium phosphate solution (1 Min water, degassed) (6.00 mL, 6.00 mmol) was added and the mixture wasstirred at 80° C. for 4 h. The mixture was concentrated in vacuo andpurified by preparative HPLC (Method 1A) to yield the title compound(0.33 g, 53% of theory).

LC-MS (Method 2B): R_(t)=1.62 min, MS (ESIPos): m/z=211 [M+H]⁺

Example 90A Tert-butyl4-(3-oxo-3-{[4-(pyridin-4-yl)-1H-indazol-3-yl]amino}propanoyl)piperidine-1-carboxylate

4-(Pyridin-4-yl)-1H-indazol-3-amine (0.33 g, 1.58 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.62 g, 1.74 mmol) were dissolved in acetonitrile (15 mL) and refluxedfor 6 h. Concentration in vacuo and purification by preparative HPLC(Method 1A) afforded the title compound (0.07 g, 10% of theory).

LC-MS (Method 1B): R_(t)=0.73 min, MS (ESIPos): m/z=464 [M+H]⁺

Example 91A Tert-butyl4-[2-oxo-10-(pyridin-4-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Tert-butyl4-(3-oxo-3-{[4-(pyridin-4-yl)-1H-indazol-3-yl]amino}propanoyl)piperidine-1-carboxylate(0.07 g, 0.15 mmol) was dissolved in 1-methoxy-2-propanol (2 mL).Potassium phosphate (0.06 g, 0.30 mmol) was added and the mixture wasstirred at 100° C. for 4 h. Concentration in vacuo and purification bypreparative HPLC (Method 1A) afforded the title compound (0.03 g, 67% oftheory).

LC-MS (Method 1B): R_(t)=0.86 min, MS (ESIPos): m/z=446 [M+H]⁺

Example 92A Tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Bromo-1H-indazol-3-amine (2.00 g, 9.43 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(3.69 g, 10.38 mmol) were dissolved in acetonitrile (90 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (25 mL). Potassiumphosphate (4.00 g, 18.9 mmol) was added and the mixture was stirred atreflux for 4 h. After concentration in vacuo, the residue was dissolvedin water and extracted with ethyl acetate. The organic phase was washedwith brine and dried over magnesium sulfate. Concentration in vacuo andpurification by preparative HPLC (Method 1A) afforded the title compoundin 93% purity. The solid was suspended in methanol, filtered, and driedto afford the title compound (0.86 g, 20% of theory).

LC-MS (Method 3B): R_(t)=2.37 min, MS (ESIPos): m/z=447 [M+H]⁺, 449[M+H]⁺

Example 93A Tert-butyl4-(10-cyclopropyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Under argon, a mixture of tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.10 g, 0.25 mmol), palladium(II)acetate (1.7 mg, 7 μmol), and2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)biphenyl (6.5 mg, 15μmol) in tetrahydrofuran (5 mL) was cooled to 0° C. Cyclopropylzincbromide (0.5 M in tetrahydrofuran, 1.24 mL, 0.62 mmol) was addeddropwise. After stirring for 4 h at RT, additional cyclopropylzincbromide (0.5 M in tetrahydrofuran, 1.24 mL, 0.62 mmol) was added and themixture was stirred at RT for 16 h. The mixture was quenched with water,extracted with ethyl acetate and dried over magnesium sulfate.Concentration in vacuo and purification by preparative HPLC (Method 1A)afforded the title compound (20 mg, 20% of theory).

LC-MS (Method 1B): R_(t)=1.16 min, MS (ESIPos): m/z=409 [M+H]⁺

Example 94A Tert-butyl4-(10-isopropyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Under argon, a mixture of tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.10 g, 0.25 mmol),[(2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)-1,1′-biphenyl)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.04 g, 0.05 mmol), and2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)biphenyl (0.02 g,0.05 mmol) was suspended in tetrahydrofuran (5 mL). Lithium chloride(0.5 M in tetrahydrofuran, 5.00 mL, 2.48 mmol) was added and the mixturewas cooled to 0° C. Isopropylzinc bromide (0.5 M in tetrahydrofuran,5.00 mL, 2.48 mmol) was added dropwise. After stirring at RT for 16 h,the mixture was quenched with water, extracted with ethyl acetate anddried over magnesium sulfate. Concentration in vacuo and purification bypreparative HPLC (Method 1A) afforded the title compound (0.03 g, 33% oftheory).

LC-MS (Method 1B): R_(t)=1.21 min, MS (ESIPos): m/z=411 [M+H]⁺

Example 95A Tert-butyl4-(10-cyclopentyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Under argon, a mixture of tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.10 g, 0.25 mmol),[(2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)-1,1′-biphenyl)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.04 g, 0.05 mmol), and2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)biphenyl (0.02 g,0.05 mmol) was suspended in tetrahydrofuran (5 mL). Lithium chloride(0.5 M in tetrahydrofuran, 5.00 mL, 2.48 mmol) was added and the mixturewas cooled to 0° C. Cyclopentylzinc bromide (0.5 M in tetrahydrofuran,5.00 mL, 2.48 mmol) was added dropwise. After stirring at RT for 16 h,the mixture was quenched with water, extracted with ethyl acetate anddried over magnesium sulfate. Concentration in vacuo and purification bypreparative HPLC (Method 1A) afforded the title compound (0.02 g, 20% oftheory).

LC-MS (Method 1B): R_(t)=1.32 min, MS (ESIPos): m/z=437 [M+H]⁺

Example 96A 4-(2-Chlorophenyl)-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),2-chlorophenylboronic acid (0.70 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (0.07 g, 0.09 mmol) were dissolved in a degassedmixture of ethanol, water, and toluene (1:1:1, 20 mL total volume).Potassium phosphate solution (1 M in water, degassed) (6.00 mL, 6.00mmol) was added and the mixture was stirred at 80° C. for 4 h. Themixture was concentrated in vacuo and purified by preparative HPLC(Method 1A) to yield the title compound (0.31 g, 42% of theory).

LC-MS (Method 1B): R_(t)=0.86 min, MS (ESIPos): m/z=244 [M+H]⁺

Example 97A Tert-butyl4-[10-(2-chlorophenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(2-Chlorophenyl)-1H-indazol-3-amine (0.30 g, 1.23 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.48 g, 1.35 mmol) were dissolved in acetonitrile (6 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (5 mL). Potassiumphosphate (0.52 g, 2.46 mmol) was added and the mixture was stirred at120° C. for 6 h. Concentration in vacuo and purification by preparativeHPLC (Method 1A) afforded the title compound (0.30 g, 51% of theory).

LC-MS (Method 1B): R_(t)=1.28 min, MS (ESIPos): m/z=479 [M+H]⁺

Example 98A 4-(2-Methoxyphenyl)-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),2-methoxyphenylboronic acid (0.68 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.07 g, 0.09mmol) were dissolved in a degassed mixture of ethanol, water, andtoluene (1:1:1, 20 mL total volume). Potassium phosphate solution (1 Min water, degassed) (6.00 mL, 6.00 mmol) was added and the mixture wasstirred at 80° C. for 4 h. The mixture was concentrated in vacuo andpurified by preparative HPLC (Method 1A) to yield the title compound(0.52 g, 72% of theory).

LC-MS (Method 1B): R_(t)=0.77 min, MS (ESIPos): m/z=240 [M+H]⁺

Example 99A Tert-butyl4-[10-(2-methoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(2-Methoxyphenyl)-1H-indazol-3-amine (0.51 g, 2.13 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.83 g, 2.35 mmol) were dissolved in acetonitrile (11 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (9 mL). Potassiumphosphate (0.90 g, 4.26 mmol) was added and the mixture was stirred at120° C. for 6 h. Concentration in vacuo and purification by preparativeHPLC (Method 1A) afforded the title compound (0.20 g, 20% of theory).

LC-MS (Method 1B): R_(t)=1.22 min, MS (ESIPos): m/z=475 [M+H]⁺

Example 100A 4-[2-(Trifluoromethyl)phenyl]-1H-indazol-3-amine

Under argon, 4-chloro-1H-indazol-3-amine (0.50 g, 2.98 mmol),2-trifluoromethylphenylboronic acid (0.85 g, 4.48 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (0.07 g, 0.09 mmol) were dissolved in a degassedmixture of ethanol, water, and toluene (1:1:1, 20 mL total volume).Potassium phosphate solution (1 M in water, degassed) (6.00 mL, 6.00mmol) was added and the mixture was stirred at 80° C. for 4 h. Themixture was concentrated in vacuo and purified by preparative HPLC(Method 1A) to yield the title compound (0.31 g, 37% of theory).

LC-MS (Method 1B): R_(t)=0.89 min, MS (ESIPos): m/z=278 [M+H]⁺

Example 101A Tert-butyl4-{2-oxo-10-[2-(trifluoromethyl)phenyl]-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate

4-[2-(Trifluoromethyl)phenyl]-1H-indazol-3-amine (0.31 g, 1.10 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.43 g, 1.21 mmol) were dissolved in acetonitrile (6 mL) and refluxedfor 6 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (5 mL). Potassiumphosphate (0.47 g, 2.20 mmol) was added and the mixture was stirred at120° C. for 6 h. Concentration in vacuo and purification by preparativeHPLC (Method 1A) afforded the title compound (0.10 g, 18% of theory).

LC-MS (Method 1B): R_(t)=1.26 min, MS (ESIPos): m/z=513 [M+H]⁺

Example 102A 2-Chloro-6-fluoro-3-methylbenzaldehyde

2-Chloro-4-fluoro-1-methylbenzene (5.00 g, 34.6 mmol) was dissolved intetrahydrofuran (100 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 21.1 mL, 38.0 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (3.03 g, 41.5 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(8 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (3.25 g, 49%of theory) in a purity of 90%.

GC-MS (Method 1G): R_(t)=3.90 min, MS (ESINeg): m/z=171 [M−H]⁻

Example 103A 2-Chloro-6-fluoro-3-methylbenzonitrile

A mixture of 2-chloro-6-fluoro-3-methylbenzaldehyde (90% purity, 3.25 g,18.8 mmol), sodium lauryl sulfate (1.09 g, 3.77 mmol),(Diacetoxyiodo)benzene (9.10 g, 28.2 mmol) and ammonium acetate (7.26 g,94.2 mmol) in water (20 mL) was stirred at 70° C. for 30 min. Aftercooling to RT, a solution of sodium thiosulfate (3.33 g, 21.1 mmol) inwater (3.5 mL) was added and the mixture was stirred at RT for 15 min.After extraction with dichloromethane, the organic phase was dried overmagnesium sulfate. Concentration in vacuo and purification bypreparative HPLC (Method 1A) afforded the title compound (1.26 g, 39% oftheory).

GC-MS (Method 1G): R_(t)=3.94 min, MS (ESIPos): m/z=169 [M+H]⁺

Example 104A 4-Chloro-5-methyl-1H-indazol-3-amine

2-chloro-6-fluoro-3-methylbenzonitrile (1.26 g, 7.43 mmol) was dissolvedin ethanol (10 mL) and treated with hydrazine hydrate (1.49 g, 29.7mmol). After stirring at reflux for 4 h, the mixture was cooled to RTand concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, concentrated in vacuo anddried to yield the title compound (1.06 g, 79% of theory) in a purity of75%.

LC-MS (Method 2B): R_(t)=1.85 min, MS (ESIPos): m/z=182 [M+H]⁺

Example 105A Tert-butyl4-(10-chloro-9-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Chloro-5-methyl-1H-indazol-3-amine (75% purity, 1.06 g, 4.38 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(2.29 g, 6.42 mmol) were dissolved in acetonitrile (50 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (20 mL). Potassiumphosphate (2.36 g, 11.1 mmol) was added and the mixture was stirred atreflux for 4 h. After concentration in vacuo, the residue was dissolvedin water and extracted with ethyl acetate. The organic phase was washedwith brine and dried over magnesium sulfate. Concentration in vacuo andrecrystallization from acetonitrile/methanol afforded the title compound(0.76 g, 33% of theory).

LC-MS (Method 1B): R_(t)=1.16 min, MS (ESIPos): m/z=417 [M+H]⁺

Example 106A 2-Bromo-3,6-difluorobenzaldehyde

2-Bromo-1,4-difluorobenzene (5.00 g, 25.9 mmol) was dissolved intetrahydrofuran (100 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 15.8 mL, 28.5 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (2.28 g, 31.1 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(6 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (2.72 g, 42%of theory) in a purity of 90%.

GC-MS (Method 2G): R_(t)=3.40 min, MS (ESIPos): m/z=221 [M+H]⁺

Example 107A 2-Bromo-3,6-difluorobenzonitrile

A mixture of 2-bromo-3,6-difluorobenzaldehyde (90% purity, 2.72 g, 11.1mmol), sodium lauryl sulfate (0.71 g, 2.46 mmol), (Diacetoxyiodo)benzene(5.95 g, 18.5 mmol) and ammonium acetate (4.74 g, 61.5 mmol) in water(13 mL) was stirred at 70° C. for 30 min. After cooling to RT, asolution of sodium thiosulfate (2.18 g, 13.8 mmol) in water (2.3 mL) wasadded and the mixture was stirred at RT for 15 min. After extractionwith dichloromethane, the organic phase was dried over magnesiumsulfate. Concentration in vacuo and purification by preparative HPLC(Method 1A) afforded the title compound (1.32 g, 44% of theory).

GC-MS (Method 1G): R_(t)=3.73 min, MS (ESIPos): m/z=217 [M+H]⁺

Example 108A 4-Bromo-5-fluoro-1H-indazol-3-amine

2-Bromo-3,6-difluorobenzonitrile (1.32 g, 6.06 mmol) was dissolved inethanol (10 mL) and treated with hydrazine hydrate (1.21 g, 24.2 mmol).After stirring at reflux for 4 h, the mixture was cooled to RT andconcentrated in vacuo. The residue was dissolved in a mixture of waterand ethyl acetate. The aqueous layer was extracted once more with ethylacetate. The combined organic layers were washed with water and withbrine, dried over magnesium sulfate, concentrated in vacuo and dried toyield the title compound (1.25 g, 83% of theory) in a purity of 92%.

LC-MS (Method 2B): R_(t)=1.78 min, MS (ESIPos): m/z=230 [M+H]⁺

Example 109A Tert-butyl4-(10-bromo-9-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Bromo-5-fluoro-1H-indazol-3-amine (92% purity, 1.25 g, 5.01 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(2.13 g, 6.00 mmol) were dissolved in acetonitrile (50 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (20 mL). Potassiumphosphate (2.42 g, 11.4 mmol) was added and the mixture was stirred atreflux for 4 h. After concentration in vacuo, the residue was dissolvedin water and extracted with ethyl acetate. The organic phase was washedwith brine and dried over magnesium sulfate. Concentration in vacuo andrecrystallization from acetonitrile/methanol afforded the title compound(0.70 g, 29% of theory).

LC-MS (Method 1B): R_(t)=1.16 min, MS (ESIPos): m/z=466 [M+H]⁺

Example 110A 6-Bromo-2,3-difluorobenzaldehyde

4-Bromo-1,2-difluorobenzene (5.00 g, 25.9 mmol) was dissolved intetrahydrofuran (100 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 15.8 mL, 28.5 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (2.28 g, 31.1 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(6 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (2.59 g, 52%of theory).

GC-MS (Method 2G): R_(t)=3.28 min, MS (ESIPos): m/z=221 [M+H]⁺

Example 111A 6-Bromo-2,3-difluorobenzonitrile

A mixture of 6-bromo-2,3-difluorobenzaldehyde (2.59 g, 11.7 mmol),sodium lauryl sulfate (0.68 g, 2.34 mmol), (Diacetoxyiodo)benzene (5.66g, 17.6 mmol) and ammonium acetate (4.52 g, 58.6 mmol) in water (12 mL)was stirred at 70° C. for 30 min. After cooling to RT, a solution ofsodium thiosulfate (2.08 g, 13.1 mmol) in water (2.2 mL) was added andthe mixture was stirred at RT for 15 min. After extraction withdichloromethane, the organic phase was dried over magnesium sulfate.Concentration in vacuo and purification by preparative HPLC (Method 1A)afforded the title compound (0.78 g, 31% of theory).

GC-MS (Method 1G): R_(t)=3.59 min, MS (ESIPos): m/z=217 [M+H]⁺

Example 112A 4-Bromo-7-fluoro-1H-indazol-3-amine

6-Bromo-2,3-difluorobenzonitrile (0.78 g, 3.58 mmol) was dissolved inethanol (10 mL) and treated with hydrazine hydrate (0.72 g, 14.3 mmol).After stirring at reflux for 4 h, the mixture was cooled to RT andconcentrated in vacuo. The residue was dissolved in a mixture of waterand ethyl acetate. The aqueous layer was extracted once more with ethylacetate. The combined organic layers were washed with water and withbrine, dried over magnesium sulfate, concentrated in vacuo and dried toyield the title compound (0.77 g, 94% of theory).

LC-MS (Method 2B): R_(t)=1.83 min, MS (ESIPos): m/z=230 [M+H]⁺

Example 113A Tert-butyl4-(10-bromo-7-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Bromo-7-fluoro-1H-indazol-3-amine (0.77 g, 3.36 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(1.31 g, 3.70 mmol) were dissolved in acetonitrile (30 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (10 mL). Potassiumphosphate (1.37 g, 6.46 mmol) was added and the mixture was stirred atreflux for 4 h. After concentration in vacuo, the residue was dissolvedin water and extracted with ethyl acetate. The organic phase was washedwith brine and dried over magnesium sulfate. Concentration in vacuo andrecrystallization from acetonitrile/methanol afforded the title compound(0.48 g, 32% of theory).

LC-MS (Method 1B): R_(t)=1.16 min, MS (ESIPos): m/z=465 [M+H]⁺

Example 114A Tert-butyl4-(10-sec-butyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Under argon, a mixture of tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.11 g, 0.27 mmol),[(2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)-1,1′-biphenyl)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.04 g, 0.055 mmol), and2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)biphenyl (0.02 g,0.055 mmol) was suspended in tetrahydrofuran (5 mL). Lithium chloride(0.5 M in tetrahydrofuran, 5.50 mL, 2.73 mmol) was added and the mixturewas cooled to 0° C. Isopropylzinc bromide (0.5 M in tetrahydrofuran,5.50 mL, 2.73 mmol) was added dropwise. After stirring at RT for 16 h,the mixture was quenched with water, extracted with ethyl acetate anddried over magnesium sulfate. Concentration in vacuo and purification bypreparative HPLC (Method 1A) afforded the title compound (28 mg, 24% oftheory).

LC-MS (Method 1B): R_(t)=1.26 min, MS (ESIPos): m/z=425 [M+H]⁺

Example 115A Tert-butyl4-(10-isobutyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Under argon, a mixture of tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.50 mmol),[(2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)-1,1′-biphenyl)-2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (0.08 g, 0.10 mmol), and2-dicyclohexylphosphino-2′,6′-bis(N,N-dimethylamino)biphenyl (0.04 g,0.10 mmol) was suspended in tetrahydrofuran (10 mL). Lithium chloride(0.5 M in tetrahydrofuran, 9.90 mL, 4.96 mmol) was added and the mixturewas cooled to 0° C. Isopropylzinc bromide (0.5 M in tetrahydrofuran,9.90 mL, 4.96 mmol) was added dropwise. After stirring at RT for 16 h,the mixture was quenched with water, extracted with ethyl acetate anddried over magnesium sulfate. Concentration in vacuo and purification bypreparative HPLC (Method 1A) afforded the title compound (98 mg, 47% oftheory).

LC-MS (Method 1B): R_(t)=1.30 min, MS (ESIPos): m/z=425 [M+H]⁺

Example 116A 2-Bromo-6-fluoro-3-methylbenzaldehyde

2-Bromo-4-fluoro-1-methylbenzene (5.00 g, 25.9 mmol) was dissolved intetrahydrofuran (100 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 16.2 mL, 29.1 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (2.32 g, 31.7 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(6 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (6.05 g, 84%of theory) in a purity of 80%.

GC-MS (Method 1G): R_(t)=4.38 min, MS (ESIPos): m/z=217 [M+H]⁺

Example 117A 2-Bromo-6-fluoro-3-methylbenzonitrile

A mixture of 2-bromo-3,6-difluorobenzaldehyde (80% purity, 6.05 g, 22.2mmol), sodium lauryl sulfate (1.61 g, 5.57 mmol), (Diacetoxyiodo)benzene(13.5 g, 41.8 mmol) and ammonium acetate (10.7 g, 139.4 mmol) in water(30 mL) was stirred at 70° C. for 30 min. After cooling to RT, asolution of sodium thiosulfate (4.94 g, 31.2 mmol) in water (5 mL) wasadded and the mixture was stirred at RT for 15 min. After extractionwith dichloromethane, the organic phase was dried over magnesium sulfateand concentrated in vacuo. A portion of the residue was purified bypreparative HPLC (Method 1A) to afford the title compound (1.03 g).

GC-MS (Method 1G): R_(t)=4.46 min, MS (ESIPos): m/z=213 [M+H]⁺

Example 118A 4-Bromo-5-methyl-1H-indazol-3-amine

2-Bromo-6-fluoro-3-methylbenzonitrile (0.30 g, 1.40 mmol) was dissolvedin ethanol (2 mL) and treated with hydrazine hydrate (0.28 g, 5.6 mmol).After stirring at reflux for 4 h, the mixture was cooled to RT andconcentrated in vacuo. The residue was dissolved in a mixture of waterand ethyl acetate. The aqueous layer was extracted once more with ethylacetate. The combined organic layers were washed with water and withbrine, dried over magnesium sulfate, concentrated in vacuo and dried toyield the title compound (0.28 g, 62% of theory) in a purity of 70%.

LC-MS (Method 2B): R_(t)=1.90 min, MS (ESIPos): m/z=226 [M+H]⁺

Example 119A Tert-butyl4-(10-bromo-9-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Bromo-5-methyl-1H-indazol-3-amine (70% purity, 0.28 g, 0.86 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.48 g, 1.36 mmol) were dissolved in acetonitrile (12 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (5 mL). Potassiumphosphate (0.53 g, 2.47 mmol) was added and the mixture was stirred at70° C. for 6 h. Concentration in vacuo and purification via preparativeHPLC (Method 1A) afforded the title compound (0.22 g, 56% of theory).

LC-MS (Method 1B): R_(t)=1.21 min, MS (ESIPos): m/z=461 [M+H]⁺

Example 120A 6-Bromo-2-fluoro-3-methylbenzaldehyde

4-Bromo-2-fluoro-1-methylbenzene (5.00 g, 26.5 mmol) was dissolved intetrahydrofuran (100 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 16.2 mL, 29.1 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (2.32 g, 31.7 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(6 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (5.63 g, 83%of theory) in a purity of 85%.

GC-MS (Method 1G): R_(t)=4.35 min, MS (ESIPos): m/z=217 [M+H]⁺

Example 121A 6-Bromo-2-fluoro-3-methylbenzonitrile

A mixture of 6-bromo-2-fluoro-3-methylbenzaldehyde (85% purity, 5.63 g,22.1 mmol), sodium lauryl sulfate (1.50 g, 5.19 mmol),(Diacetoxyiodo)benzene (12.5 g, 38.9 mmol) and ammonium acetate (10.0 g,129.7 mmol) in water (30 mL) was stirred at 70° C. for 30 min. Aftercooling to RT, a solution of sodium thiosulfate (4.60 g, 29.1 mmol) inwater (5 mL) was added and the mixture was stirred at RT for 15 min.After extraction with dichloromethane, the organic phase was dried overmagnesium sulfate and concentrated in vacuo. A portion of the residuewas purified by preparative HPLC (Method 1A) to afford the titlecompound (0.45 g).

Example 122A Tert-butyl4-(10-bromo-7-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

6-Bromo-2-fluoro-3-methylbenzonitrile (0.45 g, 2.09 mmol) was dissolvedin ethanol (3 mL) and treated with hydrazine hydrate (0.42 g, 8.37mmol). After stirring at reflux for 4 h, the mixture was cooled to RTand concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, and concentrated in vacuo. Theresidue and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.82 g, 2.30 mmol) were dissolved in acetonitrile (20 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (9 mL). Potassiumphosphate (0.89 g, 4.17 mmol) was added and the mixture was stirred at70° C. for 6 h. Concentration in vacuo and purification via preparativeHPLC (Method 1A) afforded the title compound (0.47 g, 49% of theory).

LC-MS (Method 1B): R_(t)=1.25 min, MS (ESIPos): m/z=461 [M+H]⁺

Example 123A 4-Isopropoxy-1H-indazol-3-amine

2-Fluoro-6-isopropoxybenzonitrile (0.50 g, 2.79 mmol) was dissolved inethanol (10 mL) and treated with hydrazine hydrate (0.56 g, 11.2 mmol).After stirring at reflux for 8 h, the mixture was cooled to RT andconcentrated in vacuo. The residue was dissolved in a mixture of waterand ethyl acetate. The aqueous layer was extracted once more with ethylacetate. The combined organic layers were washed with water and withbrine, dried over magnesium sulfate, concentrated in vacuo and dried toyield the title compound (0.53 g, 90% of theory) in a purity of 90%.

LC-MS (Method 2B): R_(t)=1.90 min, MS (ESIPos): m/z=192 [M+H]⁺

Example 124A Tert-butyl4-(10-isopropoxy-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Isopropoxy-1H-indazol-3-amine (90% purity, 0.52 g, 2.45 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(1.06 g, 2.99 mmol) were dissolved in acetonitrile (25 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (20 mL). Potassiumphosphate (0.82 g, 3.88 mmol) was added and the mixture was stirred at70° C. for 6 h. Concentration in vacuo and purification via preparativeHPLC (Method 1A) afforded the title compound (0.14 g, 18% of theory).

LC-MS (Method 1B): R_(t)=1.16 min, MS (ESIPos): m/z=427 [M+H]⁺

Example 125A Tert-butyl4-(9-fluoro-2-oxo-10-phenyl-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-9-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.15 g, 0.32 mmol), phenylboronic acid (0.043 g, 0.36 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (8 mg, 10μmol) were dissolved in degassed tetrahydrofuran (3 mL). Potassiumphosphate solution (1 M in water, degassed) (1.90 mL, 1.90 mmol) wasadded and the mixture was stirred at 40° C. for 10 min. The mixture wasdiluted with water, and extracted with dichloromethane. The organicphase was dried over magnesium sulfate and concentrated in vacuo.Purification by preparative HPLC (Method 1A) afforded the title compound(69 mg, 46% of theory).

LC-MS (Method 1B): R_(t)=1.21 min, MS (ESIPos): m/z=463 [M+H]⁺

Example 126A 2′,3,6′-Trifluorobiphenyl-2-carbonitrile

Under argon, 2-bromo-6-fluorobenzonitrile (0.50 g, 2.50 mmol),2,6-difluorophenylboronic acid (0.443 g, 2.75 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (63 mg, 0.08 mmol) were dissolved in degassedtetrahydrofuran (30 mL). Potassium phosphate solution (1 M in water,degassed) (14.8 mL, 14.8 mmol) was added and the mixture was stirred atRT for 16 h. The mixture was concentrated in vacuo. Purification bypreparative HPLC (Method 1A) afforded the title compound (0.19 g, 32% oftheory).

GC-MS (Method 1G): R_(t)=5.34 min, MS (ESIPos): m/z=233 [M]

Example 127A Tert-butyl4-[10-(2,6-difluorophenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

2′,3,6′-Trifluorobiphenyl-2-carbonitrile (0.19 g, 0.79 mmol) wasdissolved in ethanol (1 mL) and treated with hydrazine hydrate (0.16 g,3.17 mmol). After stirring at reflux for 4 h, an additional portion ofhydrazine hydrate (0.16 g, 3.17 mmol) was added at RT and stirring wasresumed at reflux for 4 h. The mixture was cooled to RT and concentratedin vacuo. The residue was dissolved in a mixture of water and ethylacetate. The aqueous layer was extracted once more with ethyl acetate.The combined organic layers were washed with water and with brine, driedover magnesium sulfate, and concentrated in vacuo. The residue andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.31 g, 0.87 mmol) were dissolved in acetonitrile (8 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (5 mL). Potassiumphosphate (0.33 g, 1.58 mmol) was added and the mixture was stirred at70° C. for 6 h. Concentration in vacuo and purification via preparativeHPLC (Method 1A) afforded the title compound (0.11 g, 28% of theory).

LC-MS (Method 1B): R_(t)=1.23 min, MS (ESIPos): m/z=481 [M+H]⁺

Example 128A 2-Chloro-6-fluoro-4-methylbenzaldehyde

1-Chloro-3-fluoro-5-methylbenzene (5.00 g, 34.6 mmol) was dissolved intetrahydrofuran (100 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 21.1 mL, 38.0 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (3.03 g, 41.5 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(8 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (2.83 g, 43%of theory) in a purity of 90%.

GC-MS (Method 1G): R_(t)=3.91 min, MS (ESIPos): m/z=171 [M+H]⁺

Example 129A 2-Chloro-6-fluoro-4-methylbenzonitrile

A mixture of 2-chloro-6-fluoro-4-methylbenzaldehyde (90% purity, 2.80 g,14.6 mmol), sodium lauryl sulfate (0.94 g, 3.25 mmol),(Diacetoxyiodo)benzene (7.4 g, 24.3 mmol) and ammonium acetate (6.25 g,81.1 mmol) in water (20 mL) was stirred at 70° C. for 30 min. Afterextraction with dichloromethane, the organic phase was dried overmagnesium sulfate and concentrated in vacuo. Purification by preparativeHPLC (Method 1A) afforded the title compound (1.34 g).

GC-MS (Method 1G): R_(t)=3.92 min, MS (ESIPos): m/z=169 [M+H]⁺

Example 130A 4-Chloro-6-methyl-1H-indazol-3-amine

2-Chloro-6-fluoro-4-methylbenzonitrile (1.33 g, 7.84 mmol) was dissolvedin ethanol (40 mL) and treated with hydrazine hydrate (1.57 g, 31.3mmol). After stirring at reflux for 4 h, the mixture was cooled to RTand concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, concentrated in vacuo anddried to yield the title compound (1.20 g, 85% of theory).

LC-MS (Method 2B): R_(t)=1.88 min, MS (ESIPos): m/z=182 [M+H]⁺

Example 131A Tert-butyl4-(10-chloro-8-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Chloro-6-methyl-1H-indazol-3-amine (0.40 g, 2.20 mmol) and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.86 g, 2.42 mmol) were dissolved in acetonitrile (18 mL) and refluxedfor 2 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (18 mL). Potassiumphosphate (0.74 g, 3.47 mmol) was added and the mixture was stirred at70° C. for 6 h. After concentration in vacuo, the residue was taken upin water and extracted with dichloromethane. The organic phase was driedover magnesium sulfate and concentrated in vacuo. Purification viapreparative HPLC (Method 1A) afforded the title compound (0.32 g, 45% oftheory).

LC-MS (Method 1B): R_(t)=1.15 min, MS (ESIPos): m/z=417 [M+H]⁺

Example 132A Tert-butyl4-{2-oxo-10-[2-(trifluoromethoxy)phenyl]-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.48 mmol), 2-trifluoromethoxyphenylboronic acid (0.10 g, 0.49mmol) and (2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (11 mg, 13μmol) were dissolved in degassed tetrahydrofuran (4 mL). Potassiumphosphate solution (1 M in water, degassed) (2.55 mL, 2.55 mmol) wasadded and the mixture was stirred at 40° C. for 2.5 h. The mixture wasdiluted with water, and extracted with ethyl acetate. The organic phasewas dried over magnesium sulfate and concentrated in vacuo. Purificationby preparative HPLC (Method 1A) afforded the title compound (107 mg, 45%of theory).

LC-MS (Method 1B): R_(t)=1.27 min, MS (ESIPos): m/z=529 [M+H]⁺

Example 133A 2-Bromo-4,6-difluorobenzaldehyde

1-Bromo-3,5-difluoro-2-iodobenzene (5.00 g, 15.7 mmol) was dissolved in2-methyltetrahydrofuran (30 mL) and cooled to 0° C. Isopropylmagnesiumchloride lithium chloride complex (1.3 M in tetrahydrofuran, 12.7 mL,16.5 mmol) was added dropwise. After stirring at 0° C. for 30 min,4-formylmorpholine (1.99 g, 17.2 mmol) was added. The mixture was warmedto RT and stirred at RT for 4 h. The mixture was quenched withhydrochloric acid (1M in water), diluted with water, and extracted withethyl acetate. The organic phase was washed with hydrochloric acid (1Min water), water, and brine, and dried over magnesium sulfate.Concentration in vacuo afforded the title compound (2.70 g, 70% oftheory) in a purity of 92%.

GC-MS (Method 1G): R_(t)=3.37 min, MS (ESIPos): m/z=219 [M+H]⁺

Example 134A 2-Bromo-4,6-difluorobenzonitrile

A mixture of 2-bromo-4,6-difluorobenzaldehyde (92% purity, 2.68 g, 11.1mmol), sodium lauryl sulfate (0.70 g, 2.43 mmol), (Diacetoxyiodo)benzene(5.86 g, 18.2 mmol) and ammonium acetate (4.67 g, 60.6 mmol) in water(20 mL) was stirred at 70° C. for 30 min. After extraction withdichloromethane, the organic phase was dried over magnesium sulfate andconcentrated in vacuo to afford the title compound (0.50 g, 16% oftheory) in a purity of 90%.

GC-MS (Method 1G): R_(t)=3.36 min, MS (ESIPos): m/z=217 [M+H]⁺

Example 135A 4-Bromo-6-fluoro-1H-indazol-3-amine

2-Bromo-4,6-difluorobenzonitrile (90% purity, 0.45 g, 1.85 mmol) wasdissolved in ethanol (10 mL) and treated with hydrazine hydrate (0.41 g,8.3 mmol). After stirring at reflux for 4 h, the mixture was cooled toRT and concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, concentrated in vacuo anddried to yield a mixture containing the title compound (0.38 g, 20% oftheory) in a purity of 25% which was taken to the next step withoutfurther purification.

LC-MS (Method 2B): R_(t)=1.86 min, MS (ESIPos): m/z=230 [M+H]⁺

Example 136A Tert-butyl4-(10-bromo-8-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Bromo-6-fluoro-1H-indazol-3-amine (25% purity, 0.38 g, 0.41 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.65 g, 1.82 mmol) were dissolved in acetonitrile (10 mL) and refluxedfor 2 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (10 mL). Potassiumphosphate (0.49 g, 2.32 mmol) was added and the mixture was stirred at100° C. for 2 h. After concentration in vacuo, the residue was taken upin water and extracted with ethyl acetate. The organic phase was washedwith water and brine, dried over magnesium sulfate, and concentrated invacuo. Purification via preparative HPLC (Method 1A) afforded the titlecompound (23 mg, 17% of theory).

LC-MS (Method 1B): R_(t)=1.19 min, MS (ESIPos): m/z=465 [M+H]⁺

Example 137A 2-Fluoro-6-(pyridin-2-yl)benzonitrile

Under argon, 2-pyridylzinc bromide (0.5 M in tetrahydrofuran, 13 mL, 6.5mmol) was diluted with tetrahydrofuran (10 mL), and2-bromo-6-fluorobenzonitrile (1.00 g, 5.00 mmol),(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (127 mg, 150 μmol),2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl (72 mg, 150μmol) were added. After stirring at RT for 16 h, the mixture was dilutedwith ethyl acetate. The organic phase was washed with water and brine,dried over magnesium sulfate, and concentrated in vacuo. Purificationvia preparative HPLC (Method 1A) afforded the title compound (263 mg,27% of theory).

LC-MS (Method 3B): R_(t)=1.81 min, MS (ESIPos): m/z=199 [M+H]⁺

Example 138A 4-(Pyridin-2-yl)-1H-indazol-3-amine

2-Fluoro-6-(pyridin-2-yl)benzonitrile (0.26 g, 1.31 mmol) was dissolvedin ethanol (5 mL) and treated with hydrazine hydrate (0.26 g, 5.25mmol). After stirring at reflux for 2 h, the mixture was cooled to RTand concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, concentrated in vacuo anddried to afford the title compound (0.31 g, 83% of theory) in a purityof 75%.

LC-MS (Method 1B): R_(t)=0.53 min, MS (ESIPos): m/z=211 [M+H]⁺

Example 139A Tert-butyl4-[2-oxo-10-(pyridin-2-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(Pyridin-2-yl)-1H-indazol-3-amine (75% purity, 0.31 g, 1.09 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.57 g, 1.60 mmol) were dissolved in acetonitrile (10 mL) and refluxedfor 2 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (15 mL). Potassiumphosphate (0.80 g, 3.75 mmol) was added and the mixture was stirred at100° C. for 2 h. After concentration in vacuo, the residue was taken upin water and extracted with ethyl acetate. The organic phase was washedwith water and brine, dried over magnesium sulfate, and concentrated invacuo. Purification via preparative HPLC (Method 1A) afforded the titlecompound (0.34 g, 54% of theory).

LC-MS (Method 1B): R_(t)=1.14 min, MS (ESIPos): m/z=446 [M+H]⁺

Example 140A 2-Fluoro-6-(1,3-thiazol-2-yl)benzonitrile

Under argon, 2-thiazolozinc bromide (0.5 M in tetrahydrofuran, 13 mL,6.5 mmol) was diluted with tetrahydrofuran (10 mL), and2-bromo-6-fluorobenzonitrile (1.00 g, 5.00 mmol),(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (127 mg, 150 μmol),2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl (72 mg, 150μmol) were added. After stirring at RT for 16 h, the mixture was dilutedwith ethyl acetate. The organic phase was washed with water and brine,dried over magnesium sulfate, and concentrated in vacuo. Purificationvia preparative HPLC (Method 1A) afforded the title compound (248 mg,24% of theory).

LC-MS (Method 1B): R_(t)=0.87 min, MS (ESIPos): m/z=205 [M+H]⁺

Example 141A 4-(1,3-Thiazol-2-yl)-1H-indazol-3-amine

2-Fluoro-6-(1,3-thiazol-2-yl)benzonitrile (0.25 g, 1.21 mmol) wasdissolved in ethanol (5 mL) and treated with hydrazine hydrate (0.24 g,4.86 mmol). After stirring at reflux for 2 h, the mixture was cooled toRT and concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, concentrated in vacuo anddried to afford the title compound (0.29 g, 76% of theory) in a purityof 70%.

LC-MS (Method 1B): R_(t)=0.66 min, MS (ESIPos): m/z=217 [M+H]⁺

Example 142A Tert-butyl4-[2-oxo-10-(1,3-thiazol-2-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(1,3-Thiazol-2-yl)-1H-indazol-3-amine (70% purity, 0.29 g, 0.98 mmol)and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.55 g, 1.55 mmol) were dissolved in acetonitrile (10 mL) and refluxedfor 2 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (15 mL). Potassiumphosphate (0.74 g, 3.49 mmol) was added and the mixture was stirred at100° C. for 2 h. After concentration in vacuo, the residue was taken upin water and extracted with ethyl acetate. The organic phase was washedwith water and brine, dried over magnesium sulfate, and concentrated invacuo. Purification via preparative HPLC (Method 1A) afforded the titlecompound (0.28 g, 50% of theory).

LC-MS (Method 1B): R_(t)=1.21 min, MS (ESIPos): m/z=452 [M+H]⁺

Example 143A Tert-butyl4-[2-oxo-10-(3-thienyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.48 mmol), 3-thienylboronic acid (63 mg, 0.49 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (11 mg, 13μmol) were dissolved in degassed tetrahydrofuran (4 mL). Potassiumphosphate solution (1 M in water, degassed) (2.55 mL, 2.55 mmol) wasadded and the mixture was stirred at 40° C. for 16 h. The mixture wasdiluted with water, and extracted with dichloromethane. The organicphase was dried over magnesium sulfate and concentrated in vacuo.Purification by preparative HPLC (Method 1A) afforded the title compound(98 mg, 49% of theory).

LC-MS (Method 1B): R_(t)=1.18 min, MS (ESIPos): m/z=451 [M+H]⁺

Example 144A Tert-butyl4-[10-(2-methylphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.48 mmol), 2-methylphenylboronic acid (67 mg, 0.49 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (11 mg, 13μmol) were dissolved in degassed tetrahydrofuran (4 mL). Potassiumphosphate solution (1 M in water, degassed) (2.55 mL, 2.55 mmol) wasadded and the mixture was stirred at 40° C. for 16 h. The mixture wasdiluted with water, and extracted with dichloromethane. The organicphase was dried over magnesium sulfate and concentrated in vacuo.Purification by preparative HPLC (Method 1A) afforded the title compound(150 mg, 73% of theory).

LC-MS (Method 1B): R_(t)=1.26 min, MS (ESIPos): m/z=459 [M+H]⁺

Example 145A Tert-butyl4-[10-(1-methyl-1H-pyrazol-5-yl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.48 mmol),1-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole(102 mg, 0.49 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (11 mg, 13 mol) were dissolved in degassedtetrahydrofuran (4 mL). Potassium phosphate solution (1 M in water,degassed) (2.55 mL, 2.55 mmol) was added and the mixture was stirred at40° C. for 48 h. Additional(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (11 mg, 13 μmol) was added and the mixture was stirredat reflux for 16 h. The phases were separated and the organic phase wassubjected to preparative HPLC (Method 1A) to afford the title compound(140 mg, 70% of theory).

LC-MS (Method 1B): R_(t)=1.05 min, MS (ESIPos): m/z=449 [M+H]⁺

Example 146A Tert-butyl4-[10-(1-methyl-1H-pyrazol-4-yl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.48 mmol), (1-methyl-1H-pyrazol-4-yl)boronic acid (62 mg, 0.49mmol) and (2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (11 mg, 13μmol) were dissolved in degassed tetrahydrofuran (4 mL). Potassiumphosphate solution (1 M in water, degassed) (2.55 mL, 2.55 mmol) wasadded and the mixture was stirred at 40° C. for 48 h. Additional(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (11 mg, 13 μmol) was added and the mixture was stirredat reflux for 16 h. The phases were separated and the organic phase wassubjected to preparative HPLC (Method 1A) to afford the title compound(121 mg, 60% of theory).

LC-MS (Method 1B): R_(t)=1.03 min, MS (ESIPos): m/z=449 [M+H]

Example 147A Tert-butyl4-[2-oxo-10-(2-thienyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.48 mmol), 2-thienylboronic acid (63 mg, 0.49 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (11 mg, 13μmol) were dissolved in degassed tetrahydrofuran (4 mL). Potassiumphosphate solution (1 M in water, degassed) (2.55 mL, 2.55 mmol) wasadded and the mixture was stirred at 40° C. for 48 h. Additional(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (11 mg, 13 μmol) was added and the mixture was stirredat reflux for 16 h. The phases were separated and the organic phase wassubjected to preparative HPLC (Method 1A) to afford the title compound(121 mg, 60% of theory).

LC-MS (Method 1B): R_(t)=1.21 min, MS (ESIPos): m/z=451 [M+H]⁺

Example 148A 2-Bromo-6-fluoro-4-methylbenzaldehyde

1-Bromo-3-fluoro-5-methylbenzene (5.00 g, 26.5 mmol) was dissolved intetrahydrofuran (100 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 16.2 mL, 29.1 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (2.32 g, 31.7 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(6 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (5.45 g, 95%of theory).

GC-MS (Method 1G): R_(t)=4.39 min, MS (ESIPos): m/z=217 [M+H]⁺

Example 149A 2-Bromo-6-fluoro-4-methylbenzonitrile

A mixture of 2-bromo-6-fluoro-4-methylbenzaldehyde (5.45 g, 25.1 mmol),sodium lauryl sulfate (1.45 g, 5.03 mmol), (Diacetoxyiodo)benzene (12.1g, 37.7 mmol) and ammonium acetate (9.68 g, 125.6 mmol) in water (25 mL)was stirred at 70° C. for 30 min. After extraction with dichloromethane,the organic phase was dried over magnesium sulfate and concentrated invacuo. Purification via preparative HPLC (Method 1A) afforded the titlecompound (4.26 g, 79% of theory).

GC-MS (Method 1G): R_(t)=4.43 min, MS (ESIPos): m/z=215 [M+H]⁺

Example 150A 4-Bromo-6-methyl-1H-indazol-3-amine

2-Bromo-6-fluoro-4-methylbenzonitrile (4.26 g, 19.9 mmol) was dissolvedin ethanol (100 mL) and treated with hydrazine hydrate (3.99 g, 79.6mmol). After stirring at reflux for 4 h, the mixture was cooled to RTand concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, concentrated in vacuo anddried to yield the title compound (4.40 g, 41% of theory) in a purity of42%.

LC-MS (Method 1B): R_(t)=0.72 min, MS (ESIPos): m/z=226 [M+H]⁺

Example 151A Tert-butyl4-(10-bromo-8-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Bromo-6-methyl-1H-indazol-3-amine (42% purity, 300 mg, 0.42 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.52 g, 1.46 mmol) were dissolved in acetonitrile (13 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (15 mL). Potassiumphosphate (0.56 g, 2.65 mmol) was added and the mixture was stirred at70° C. for 6 h. After concentration in vacuo, the residue was taken upin water and extracted with ethyl acetate. The organic phase was washedwith water and brine, dried over magnesium sulfate, and concentrated invacuo. Purification via preparative HPLC (Method 1A) afforded the titlecompound (0.40 g, 89% of theory).

LC-MS (Method 1B): R_(t)=1.19 min, MS (ESIPos): m/z=461 [M+H]⁺

Example 152A 2-Chloro-3,6-difluorobenzaldehyde

2-Chloro-1,4-difluorobenzene (1.78 g, 12.0 mmol) was dissolved intetrahydrofuran (50 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 7.3 mL, 13.2 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (1.05 g, 14.4 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(3 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (1.51 g, 71%of theory).

GC-MS (Method 1G): R_(t)=3.25 min, MS (ESIPos): m/z=177 [M+H]⁺

Example 153A 2-Chloro-3,6-difluorobenzonitrile

A mixture of 2-chloro-3,6-difluorobenzaldehyde (1.51 g, 8.5 mmol),sodium lauryl sulfate (0.49 g, 1.71 mmol), (Diacetoxyiodo)benzene (4.12g, 12.8 mmol) and ammonium acetate (3.29 g, 42.7 mmol) in water (9 mL)was stirred at 70° C. for 30 min. After extraction with dichloromethane,the organic phase was dried over magnesium sulfate and concentrated invacuo. Purification via preparative HPLC (Method 1A) afforded the titlecompound (0.42 g, 28% of theory) in a purity of 60%.

GC-MS (Method 1G): R_(t)=2.80 min, MS (ESIPos): m/z=175 [M+H]⁺

Example 154A 4-Chloro-5-fluoro-1H-indazol-3-amine

2-chloro-3,6-difluorobenzonitrile (purity 60%, 0.42 g, 1.45 mmol) wasdissolved in ethanol (12 mL) and treated with hydrazine hydrate (0.49 g,9.68 mmol). After stirring at reflux for 4 h, the mixture was cooled toRT and concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, concentrated in vacuo anddried to yield the title compound (0.32 g, 99% of theory) in a purity of85%.

LC-MS (Method 1B): R_(t)=0.63 min, MS (ESIPos): m/z=186 [M+H]⁺

Example 155A Tert-butyl4-(10-chloro-9-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Chloro-5-fluoro-1H-indazol-3-amine (85% purity, 319 mg, 1.46 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.67 g, 1.89 mmol) were dissolved in acetonitrile (16 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (15 mL). Potassiumphosphate (0.73 g, 3.43 mmol) was added and the mixture was stirred at70° C. for 6 h. After concentration in vacuo, the residue was taken upin water and extracted with ethyl acetate. The organic phase was washedwith water and brine, dried over magnesium sulfate, and concentrated invacuo. Purification via preparative HPLC (Method 1A) afforded the titlecompound (0.43 g, 70% of theory).

LC-MS (Method 1B): R_(t)=1.12 min, MS (ESIPos): m/z=421 [M+H]⁺

Example 156A 2-Fluoro-6-(1H-1,2,4-triazol-1-yl)benzonitrile

Under argon, 2,6-difluorobenzonitrile (1.00 g, 7.19 mmol) was dissolvedin dimethylsulfoxide (4 mL), and 1,2,4-triazole (0.52 g, 7.48 mmol) andcesium carbonate (2.44 g, 7.48 mmol) were added. The mixture was stirredat 50° C. for 5 h. After cooling to RT, water (20 mL) was added andstirring was continued for 15 min. The precipitate was filtered andwashed with water (10 mL). The solid was taken up indichloromethane/water and extracted with dichloromethane. The combinedorganic phases were washed with brine, and concentrated in vacuo.Purification via column chromatography (silica gel, cyclohexane/ethylacetate, Gradient) afforded the title compound (0.25 g, 18% of theory).

LC-MS (Method 1B): R_(t)=0.62 min, MS (ESIPos): m/z=189 [M+H]⁺

Example 157A 4-(1H-1,2,4-Triazol-1-yl)-1H-indazol-3-amine

2-Fluoro-6-(1H-1,2,4-triazol-1-yl)benzonitrile (0.25 g, 1.3 mmol) wasdissolved in ethanol (2.5 mL) and treated with hydrazine hydrate (0.27g, 5.3 mmol). After stirring at 70° C. for 9 h, the mixture was cooledto RT and concentrated in vacuo. The residue was dissolved in a mixtureof water and ethyl acetate. The aqueous layer was extracted once morewith ethyl acetate. The combined organic layers were washed with waterand with brine, dried over sodium sulfate, concentrated in vacuo anddried to yield the title compound (0.18 g, 66% of theory).

GC-MS (Method 1G): R_(t)=8.04 min, MS (ESIPos): m/z=200 [M+H]⁺

Example 158A Tert-butyl4-[2-oxo-10-(1H-1,2,4-triazol-1-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(1H-1,2,4-Triazol-1-yl)-1H-indazol-3-amine (180 mg, 0.88 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.34 g, 0.97 mmol) were dissolved in acetonitrile (8.5 mL) and refluxedfor 5 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (5 mL). Potassiumphosphate (0.39 g, 1.85 mmol) was added and the mixture was stirred at110° C. for 4 h. After cooling to RT, water (24 mL) was added, and themixture was neutralized with aqueous hydrogen chloride solution (1 M).The precipitate was collected via filtration, washed with water andacetonitrile, and dried to afford the title compound (96 mg, 23% oftheory).

LC-MS (Method 1B): R_(t)=0.95 min, MS (ESIPos): m/z=436 [M+H]⁺

Example 159A Tert-butyl4-[9-fluoro-10-(2-fluorophenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-9-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(purity 70%, 0.10 g, 0.16 mmol), 2-fluorophenylboronic acid (24 mg, 0.17mmol) and (2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) methanesulfonate (4 mg, 5μmol) were dissolved in degassed tetrahydrofuran (2 mL). Potassiumphosphate solution (1 M in water, degassed) (0.90 mL, 0.90 mmol) wasadded and the mixture was stirred at RT for 15 min. The mixture wasdiluted with ethyl acetate. The organic phase was washed with water andbrine, dried over magnesium sulfate, and concentrated in vacuo.Purification by preparative HPLC (Method 1A) afforded the title compound(43 mg, 57% of theory).

LC-MS (Method 1B): R_(t)=1.21 min, MS (ESIPos): m/z=481 [M+H]⁺

Example 160A Tert-butyl4-[10-(2-ethoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.48 mmol), 2-ethoxyphenylboronic acid (82 mg, 0.49 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (11 mg, 13 μmol) were dissolved in degassedtetrahydrofuran (4 mL). Potassium phosphate solution (1 M in water,degassed) (2.65 mL, 2.65 mmol) was added and the mixture was stirred at40° C. for 16 h. The phases were separated and the organic phase wassubjected to preparative HPLC (Method 1A) to afford the title compound(151 mg, 69% of theory).

LC-MS (Method 1B): R_(t)=1.23 min, MS (ESIPos): m/z=489 [M+H]⁺

Example 161A Tert-butyl4-[10-(2-isopropoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(0.20 g, 0.48 mmol), 2-isopropoxyphenylboronic acid (89 mg, 0.49 mmol)and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (11 mg, 13 μmol) were dissolved in degassedtetrahydrofuran (4 mL). Potassium phosphate solution (1 M in water,degassed) (2.65 mL, 2.65 mmol) was added and the mixture was stirred at40° C. for 16 h. The phases were separated and the organic phase wassubjected to preparative HPLC (Method 1A) to afford the title compound(134 mg, 59% of theory).

LC-MS (Method 1B): R_(t)=1.33 min, MS (ESIPos): m/z=503 [M+H]⁺

Example 162A 2-Fluoro-6-(1H-pyrazol-1-yl)benzonitrile

Under argon, 2,6-difluorobenzonitrile (4.00 g, 28.8 mmol) was dissolvedin dimethylsulfoxide (16 mL), and pyrazole (2.04 g, 29.9 mmol) andcesium carbonate (9.74 g, 29.9 mmol) were added. After stirring themixture at 50° C. for 11 h, additional pyrazole (1.18 g, 17.3 mmol) wasadded and stirring was resumed at 50° C. for 6 h. After cooling to RT,water (80 mL) was added and stirring was continued for 15 min. Themixture was extracted with ethyl acetate. The combined organic phaseswere washed with brine, dried over sodium sulfate, and concentrated invacuo. Purification via column chromatography (silica gel,cyclohexane/ethyl acetate, Gradient) afforded the title compound (4.16g, 70% of theory) in a purity of 90%.

GC-MS (Method 1G): R_(t)=5.28 min, MS (ESIPos): m/z=187 [M+H]⁺

Example 163A 4-(1H-Pyrazol-1-yl)-1H-indazol-3-amine

2-Fluoro-6-(1H-pyrazol-1-yl)benzonitrile (purity 90%, 4.16 g, 20.2 mmol)was dissolved in ethanol (45 mL) and treated with hydrazine hydrate(4.05 g, 80.9 mmol). After stirring at 70° C. for 7 h, the mixture wascooled to RT and concentrated in vacuo. The residue was dissolved in amixture of water and ethyl acetate. The aqueous layer was extracted oncemore with ethyl acetate. The combined organic layers were washed withwater and with brine, dried over sodium sulfate, concentrated in vacuoand dried. Purification via column chromatography (silica gel,cyclohexane/ethyl acetate, Gradient) afforded the title compound (2.65g, 66% of theory).

LC-MS (Method 1B): R_(t)=0.59 min, MS (ESIPos): m/z=200 [M+H]⁺

Example 164A Tert-butyl4-[2-oxo-10-(1H-pyrazol-1-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(1H-Pyrazol-1-yl)-1H-indazol-3-amine (500 mg, 2.51 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.98 g, 2.76 mmol) were dissolved in acetonitrile (8.5 mL) and refluxedfor 5 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (5 mL). Potassiumphosphate (0.39 g, 1.85 mmol) was added and the mixture was stirred at110° C. for 4 h. After cooling to RT, water (24 mL) was added, and themixture was neutralized with aqueous hydrogen chloride solution (1 M).The precipitate was collected via filtration, washed with water andacetonitrile, and dried to afford the title compound (96 mg, 23% oftheory).

LC-MS (Method 1B): R_(t)=0.95 min, MS (ESIPos): m/z=436 [M+H]⁺

Example 165A Tert-butyl4-[10-(2-fluoro-6-methoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

Under argon, tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(50 mg, 0.11 mmol) and(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II)methanesulfonate (104 mg, 0.12 mmol) were dissolved in degassedtetrahydrofuran (1.5 mL) and treated with potassium phosphate solution(1 M in water, degassed) (0.44 mL, 0.44 mmol). After stirring at RT for15 min, a solution of 2-fluoro-6-methoxyboronic acid (38 mg, 0.22 mmol)and 1-bromo-3,5-difluorobenzene (43 mg, 0.22 mmol) in degassedtetrahydrofuran (0.5 mL) was added and stirring was resumed at RT for 15min. The mixture was taken up in a mixture of water and ethyl acetate.The aqueous phase was extracted twice with ethyl acetate. The combinedorganic phases were washed with brine and dried over sodium sulfate.Separation via column chromatography (gradient cyclohexane/ethylacetate) followed by preparative HPLC (Method 1A) afforded the titlecompound (21 mg, 36% of theory).

LC-MS (Method 1B): R_(t)=1.18 min, MS (ESIPos): m/z=493 [M+H]⁺

Example 166A Isomer Mixture of2-fluoro-6-(2H-1,2,3-triazol-2-yl)benzonitrile and2-fluoro-6-(1H-1,2,3-triazol-1-yl)benzonitrile

Under argon, 2,6-difluorobenzonitrile (5.00 g, 35.9 mmol) was dissolvedin dimethylsulfoxide (20 mL), and 1,2,3-triazole (2.58 g, 37.4 mmol) andcesium carbonate (12.18 g, 37.4 mmol) were added. After stirring themixture at 50° C. for 10 h, additional 1,2,3-triazole (1.25 g, 18.7mmol) was added and stirring was resumed at 50° C. for 6 h. Aftercooling to RT, water (90 mL) was added and stirring was continued for 10min. The mixture was extracted with ethyl acetate. The combined organicphases were washed with brine, dried over sodium sulfate, andconcentrated in vacuo to afford a mixture of the isomers of the titlecompounds (ca 7:1, 9.73 g, 65% of theory) in a purity of 46%.

Major Isomer (2-fluoro-6-(2H-1,2,3-triazol-2-yl)benzonitrile): GC-MS(Method 1G): R_(t)=5.56 min, MS (ESIPos): m/z=188 [M+H]⁺

Minor Isomer (2-fluoro-6-(1H-1,2,3-triazol-1-yl)benzonitrile): GC-MS(Method 1G): R_(t)=5.92 min, MS (ESIPos): m/z=188 [M+H]⁺

Examples 167A and 168A 4-(2H-1,2,3-Triazol-2-yl)-1H-indazol-3-amine and4-(1H-1,2,3-triazol-1-yl)-1H-indazol-3-amine

The 7:1 mixture of 2-fluoro-6-(2H-1,2,3-triazol-2-yl)benzonitrile and2-fluoro-6-(1H-1,2,3-triazol-1-yl)benzonitrile obtained in Example 166A(purity 46%, 9.73 g, 23.8 mmol) was dissolved in ethanol (80 mL) andtreated with hydrazine hydrate (7.25 g, 144.8 mmol). After stirring at70° C. for 7 h, the mixture was cooled to RT and concentrated in vacuo.The residue was dissolved in a mixture of water and ethyl acetate. Theaqueous layer was extracted twice with ethyl acetate. The combinedorganic layers were washed with water and with brine, dried over sodiumsulfate and concentrated in vacuo. Separation and purification by columnchromatography (eluent dichloromethane, then dichloromethane/ethanol)afforded the two isomers 4-(2H-1,2,3-triazol-2-yl)-1H-indazol-3-amine(1.13 g, 23% of theory) and 4-(1H-1,2,3-triazol-1-yl)-1H-indazol-3-amine(0.29 g, 6% of theory).

4-(2H-1,2,3-triazol-2-yl)-1H-indazol-3-amine: LC-MS (Method 2B):R_(t)=1.64 min, MS (ESIPos): m/z=201 [M+H]⁺

4-(1H-1,2,3-triazol-1-yl)-1H-indazol-3-amine: LC-MS (Method 2B):R_(t)=1.67 min, MS (ESIPos): m/z=201 [M+H]⁺

Example 169A Tert-butyl4-[2-oxo-10-(2H-1,2,3-triazol-2-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(2H-1,2,3-Triazol-2-yl)-1H-indazol-3-amine (500 mg, 2.37 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.93 g, 2.61 mmol) were dissolved in acetonitrile (8.5 mL) and refluxedfor 4 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (20 mL). Potassiumphosphate (0.94 g, 4.45 mmol) was added and the mixture was stirred at50° C. for 4 h. After cooling to RT, water was added, and the mixturewas neutralized with aqueous hydrogen chloride solution (1 M). Theprecipitate was collected via filtration, triturated with acetonitrile,and dried to afford the title compound (750 mg, 77% of theory).

LC-MS (Method 1B): R_(t)=1.11 min, MS (ESIPos): m/z=436 [M+H]⁺

Example 170A Tert-butyl4-[2-oxo-10-(1H-1,2,3-triazol-1-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

4-(1H-1,2,3-Triazol-1-yl)-1H-indazol-3-amine (280 mg, 2.37 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.53 g, 1.49 mmol) were dissolved in acetonitrile (8.5 mL) and refluxedfor 4 h. Additional tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(0.24 g, 0.68 mmol) was added and the mixture was refluxed for another 6h. After cooling to RT, the solvent was removed in vacuo and the residuewas dissolved in 1-methoxy-2-propanol (20 mL). Potassium phosphate (0.70g, 3.28 mmol) was added and the mixture was stirred at 110° C. for 4 h.After cooling to RT, water was added, and the mixture was neutralizedwith aqueous hydrogen chloride solution (1 M). The aqueous phase waswashed with ethyl acetate and left standing over night. The precipitatewas collected via filtration, washed with acetonitrile, and dried toafford the title compound (240 mg, 23% of theory).

LC-MS (Method 1B): R_(t)=1.01 min, MS (ESIPos): m/z=436 [M+H]⁺

Example 171A 6-Chloro-2-fluoro-3-methylbenzaldehyde

4-Chloro-2-fluorotoluene (5.00 g, 34.6 mmol) was dissolved intetrahydrofuran (100 mL) and cooled to −78° C. Lithium diisopropyl amide(1.8 M in tetrahydrofuran, 21.1 mL, 38.0 mmol) was added. After stirringat −78° C. for 30 min, N,N-dimethylformamide (3.03 g, 41.5 mmol) wasadded. After stirring at −78° C. for an additional 15 min, acetic acid(8 mL) and water (100 mL) was added and the mixture was warmed to RT.After extraction with ethyl acetate, the organic phase was washed with 1M hydrochloride acid solution and brine, and dried over magnesiumsulfate. Concentration in vacuo afforded the title compound (5.93 g, 94%of theory).

GC-MS (Method 1G): R_(t)=3.86 min, MS (ESIPos): m/z=172 [M+H]⁺

Example 172A 6-Chloro-2-fluoro-3-methylbenzonitrile

A mixture of 6-chloro-2-fluoro-3-methylbenzaldehyde (5.90 g, 34.2 mmol),sodium lauryl sulfate (1.97 g, 6.84 mmol), (Diacetoxyiodo)benzene (16.5g, 51.3 mmol) and ammonium acetate (13.2 g, 170.9 mmol) in water (35 mL)was stirred at 70° C. for 30 min. After extraction with dichloromethane,the organic phase was dried over magnesium sulfate and concentrated invacuo. Purification via preparative HPLC (Method 1A) afforded the titlecompound (1.12 g, 19% of theory).

GC-MS (Method 1G): R_(t)=3.90 min, MS (ESIPos): m/z=169 [M+H]⁺

Example 173A 4-Chloro-7-methyl-1H-indazol-3-amine

6-Chloro-2-fluoro-3-methylbenzonitrile (1.12 g, 6.60 mmol) was dissolvedin ethanol (10 mL) and treated with hydrazine hydrate (1.32 g, 26.4mmol). After stirring at 70° C. for 6 h, the mixture was cooled to RTand concentrated in vacuo. The residue was dissolved in a mixture ofwater and ethyl acetate. The aqueous layer was extracted once more withethyl acetate. The combined organic layers were washed with water andwith brine, dried over magnesium sulfate, concentrated in vacuo anddried to yield the title compound (1.25 g, 99% of theory) in a purity of95%.

LC-MS (Method 2B): R_(t)=1.87 min, MS (ESIPos): m/z=182 [M+H]⁺

Example 174A Tert-butyl4-(10-chloro-7-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate

4-Chloro-7-methyl-1H-indazol-3-amine (purity 95%, 200 mg, 1.05 mmol) andtert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(409 mg, 1.15 mmol) were dissolved in acetonitrile (10 mL) and refluxedfor 2 h. After cooling to RT, the solvent was removed in vacuo and theresidue was dissolved in 1-methoxy-2-propanol (10 mL). Potassiumphosphate (0.30 g, 1.43 mmol) was added and the mixture was stirred at110° C. for 4 h. After concentration in vacuo, purification viapreparative HPLC (Method 1A) afforded the title compound (230 g, 77% oftheory).

LC-MS (Method 1B): R_(t)=1.24 min, MS (ESIPos): m/z=417 [M+H]⁺

Example 175A Cis-methyl 2-methylpiperidine-4-carboxylate

A solution of (+)-Cis-1-benzyl 4-methyl2-methylpiperidine-1,4-dicarboxylate (21.15 g, 72.60 mmol) in ethanol(250 ml) was treated with palladium on charcoal 10% (1.54 g, 1.45 mmol)under hydrogen atmosphere at normal pressure and RT for 16 h. Themixture was filtered through celite and the filtrate was evaporated anddried under vacuo to yield the title compound (11.42 g, 95% of theory).

LC-MS (MCW-ZQ3-EXT-B): R_(t)=1.10 min, MS (ESIPos): m/z=158 [M+H]⁺

Example 176A Cis-1-tert-butyl 4-methyl2-methylpiperidine-1,4-dicarboxylate

To a solution of cis-methyl 2-methylpiperidine-4-carboxylate obtained inexample 175A (11.70 g, 74.42 mmol) in tetrahydrofuran (250 ml) underargon atmosphere was added di-tert-butyl dicarbonate (19.49 g, 89.30mmol) and the reaction mixture was stirred at RT overnight. The mixturewas evaporated under vacuo and the crude product was dissolved in ethylacetate and treated with a 10% citric acid aqueous solution. Afterseparation of the layers the organic layer was washed with 10% citricacid aqueous solution, with a saturated aqueous solution of sodiumhydrogen carbonate and finally with brine. The organic phase was driedover magnesium sulfate, filtered and evaporated to yield the titlecompound (23.69 g, 90% of theory, 73% pure according NMR). The crudeproduct was used in the next step without further purification.

MS (ESIPos): m/z=258 [M+H]⁺

Example 177A Cis-1-(tert-butoxycarbonyl)-2-methylpiperidine-4-carboxylicacid

To a solution of cis-1-tert-butyl 4-methyl2-methylpiperidine-1,4-dicarboxylate obtained in example 176A (23.69 g,92.06 mmol) in a mixture of tetrahydrofuran (250 ml) and water (125 ml)was added lithium hydroxide (8.82 g, 368.24 mmol) and the mixture wasstirred overnight at RT. The mixture was evaporated under vacuo and wasdiluted in water and ethyl acetate. After separation of the layers theaqueous phase was treated with HCl 1M until pH 4 was achieved and thenwas extracted with ethyl acetate, dried over magnesium sulfate, filteredand evaporated under vacuo to yield the title compound (14.85 g, 66% oftheory).

LC-MS (Method 2B): R_(t)=1.45 min, MS (ESIPos): m/z=242 [M−H]⁻

¹H-NMR (400 MHz, DMSO-d₆): δ=12.33 (bs, 1H), 4.07-3.99 (m, 1H),3.68-3.60 (m, 1H), 3.07-2.97 (m, 1H), 1.87-1.75 (m, 4H), 1.62-1.52 (m,1H), 1.39 (s, 9H), 1.04 (d, 3H).

Example 178A (+)-Cis-tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]-2-methylpiperidine-1-carboxylate

To a solution ofcis-1-(tert-butoxycarbonyl)-2-methylpiperidine-4-carboxylic acidobtained in example 177A (1.00 g, 4.11 mmol) and2,2-dimethyl-1,3-dioxane-4,6-dione (0.65 g, 4.52 mmol) indichloromethane (10 ml) was added 4-dimethylaminopyridin (0.75 g, 6.16mmol). After cooling the mixture to 0° C.,1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.10 g,5.75 mmol) was added in portions and then the reaction mixture wasstirred at RT for 16 h. The mixture was diluted in dichloromethane andthen treated with HCl 1M. After that the layers were separated. Theorganic layer was washed with HCl 1M, water and brine and finally wasdried over magnesium sulfate, filtered and evaporated under vacuo toyield the title compound (1.49 g, 94% of theory).

LC-MS (Method 1B): R_(t)=1.18 min, MS (ESIPos): m/z=370 [M+H]⁺

[α]²=+65.33 (c. 0.375, methanol) WL=589 nm

Example 179A (+)-Cis-Tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)-2-methylpiperidine-1-carboxylate[Enantiomerically Pure Cis-Isomer]

The title compound was prepared according to General Procedure 1Astarting from 0.26 g (1.48 mmol) 4-chloro-1H-indazol-3-amine and 0.55 g(1.48 mmol) (+)-cis-tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]-2-methylpiperidine-1-carboxylate.Then the mixture was diluted with water and was treated with 1Nhydrochloric acid until pH 5 was achieved and finally extracted withethyl acetate. The organic layer was washed with water, brine and driedover magnesium sulfate, filtered, evaporated and dried in vacuo. Thecrude was purified by preparative HPLC (Method 1A). The combined productfractions were evaporated and lyophilized overnight. Epimerization wasobserved obtaining a mixture of diastereomers which were separated byMethod 5C to yield the title compound, which was after then stirred inacetonitrile. The resulting solid was filtered, washed with acetonitrileand dried overnight in vacuo at 60° C. to yield the title compound. Thefiltrate was purified by preparative HPLC (Method 1A). The combinedproduct fractions were evaporated and lyophilized overnight to yield thetitle compound (65 mg, 10% of theory).

LC-MS (Method 1B): RT=1.18 min, MS (ESIPos): m/z=417 (M+H)⁺

HPLC (Method 5E): R_(t)=7.19 min

[α]²⁰=+24.9 (c. 0.30, methanol) WL=589 nm

Example 180A (3-amino-1H-indazol-4-yl)acetonitrile

To a solution of 2-(cyanomethyl)-6-fluorobenzonitrile (1.00 g, 6.24mmol) in ethanol (12 mL) under argon was added hydrazine hydrate (2.38mL, 25.0 mmol) at RT. The mixture was heated to 70° C. for 5 h. Themixture was cooled to RT and concentrated in vacuo and then the residuewas dissolved in a mixture of water and ethyl acetate. The aqueous layerwas extracted once more with ethyl acetate. The combined organic layerswere washed with water and with brine, dried over magnesium sulfate,concentrated in vacuo and dried in vacuo to yield the title compound(0.80 g, 62% of theory, 80% pure according LC-MS).

LC-MS (Method 2B): R_(t)=1.54 min, MS (ESIPos): m/z=173 [M+H]⁺

Example 181A Tert-butyl4-[10-(cyanomethyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

(3-amino-1H-indazol-4-yl)acetonitrile (purity 80%, 589 mg, 2.74 mmol)and tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(863 mg, 2.28 mmol) were dissolved in acetonitrile (8.6 mL) and stirredat 60° C. for 5 h. After cooling to RT, the solvent was removed in vacuoand the residue was dissolved in 1-methoxy-2-propanol (8.6 mL).Potassium phosphate (969 mg, 4.57 mmol) was added and the mixture wasstirred at 110° C. for 1 h. The mixture was diluted with water,neutralized (pH 6) by the addition of 1N HCl and the resulting solid wasfiltered, washed with water and finally purified by preparative HPLC(Method 2A) to yield the title compound (15 mg, 2% of theory).

LC-MS (Method 1B): R_(t)=1.02 min, MS (ESIPos): m/z=408 [M+H]⁺

Example 182A tert-butyl4-{2-oxo-10-[1-(tetrahydro-2H-pyran-2-yl)-1H-imidazol-5-yl]-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate

tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(200 mg, 0.45 mmol) and1-(tetrahydro-2H-pyran-2-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-imidazole(187 mg, 0.67 mmol) were dissolved in N,N-Dimethylformamide (5 ml) andtreated with sodium carbonate solution (2M in water, 0.89 ml). Afterdegassing the solution1,1′-Bis(diphenylphosphino)ferrocene-palladium(II)chloride (16.4 mg,0.02 mmol) was added. After stirring at 80° C. for 16 h, the mixture wasseparated via reverse phase HPLC (gradient acetonitrile/water with 0.1%trifluoroacetic acid) which afforded the title compound (55.4 mg, 25% oftheory).

LC-MS (Method 5B): R_(t)=0.84 min, MS (ESIPos): m/z=519.5 [M+H]⁺

Example 183A tert-butyl4-{10-[1-(tert-butoxycarbonyl)-1H-pyrrol-2-yl]-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate

tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(200 mg, 0.45 mmol) and [1-(tert-butoxycarbonyl)-1H-pyrrol-2-yl]boronicacid (142 mg, 0.67 mmol) were dissolved in N,N-Dimethylformamide (5 ml)and treated with sodium carbonate solution (2M in water, 0.89 ml). Afterdegassing the solution1,1′-Bis(diphenylphosphino)ferrocene-palladium(II)chloride (16.4 mg,0.02 mmol) was added. After stirring at 80° C. for 16 h, the mixture wasseparated via reverse phase HPLC (gradient acetonitrile/water with 0.1%trifluoroacetic acid) which afforded the title compound (149 mg, 61% oftheory).

LC-MS (Method 5B): R_(t)=1.26 min, MS (ESIPos): m/z=534.5 [M+H]⁺

Example 184A4-[1-(tert-butoxycarbonyl)piperidin-4-yl]-2-oxo-1,2-dihydropyrimido[1,2-b]indazole-10-carboxylicacid

Tert-butyl4-(10-cyano-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(Example 78A) (200 mg, 0.51 mmol) and sodium hydroxide solution (2M inwater, 25 ml, 50.8 mol) were dissolved in water (5 ml) and ethanol (40ml). After stirring at 100° C. for 4 h and 2 d at rt, the mixture wasworked up 3× with ethyl acetate and citric acid solution (10% in water).The organic phases were washed with water and dried with sodium sulfate.Drying in vacuo afforded the title compound (187 mg, 84% of theory).

LC-MS (Method 5B): R_(t)=0.95 min, MS (ESIPos): m/z=412.3 [M+H]⁺

Example 185A tert-butyl4-[2-oxo-10-(2,2,2-trifluoroethoxy)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate

tert-butyl4-[(2,2-dimethyl-4,6-dioxo-1,3-dioxan-5-yl)carbonyl]piperidine-1-carboxylate(338 mg, 0.95 mmol, 1.1 eq) and4-(2,2,2-trifluoroethoxy)-2H-indazol-3-amine (200 mg, 0.86 mmol, 1 eq)were dissolved in acetonitrile (15 mL) and refluxed for 3 h. Aftercooling to RT, the solvent was removed in vacuo and the residue wasdissolved in 1-methoxy-2-propanol (15 mL). Potassium phosphate (368 mg,1.7 mmol, 2 eq.) was added and the mixture was stirred at 100° C. for 4h. After concentration in vacuo, purification via reverse phase HPLC(gradient acetonitrile/water with 0.1% formic acid) afforded the titlecompound (190 mg, 47% of theory).

LC-MS (Method 1B): R_(t)=1.04 min, MS (ESIPos): m/z=467 [M+H]⁺

Example 186A 4-(2,2,2-trifluoroethoxy)-1H-indazol-3-amine

To a solution of 2-(2,2,2-trifluoroethoxy)-6-fluorobenzonitrile (1.00 g,4.56 mmol, 1 eq) in ethanol (30 mL) was added hydrazine hydrate (0.88mL, 18 mmol, 4 eq) at RT. The mixture was stirred at rt for 16 h and theheated to 70° C. over night. The solvents were removed in vacuo and theobtained residue purification via reverse phase HPLC (gradientacetonitrile/water with 0.1% trifluoro acetic acid) afforded the titlecompound (430 mg, 35% of theory).

LC-MS (Method 7B): R_(t)=1.89 min, MS (ESIPos): m/z=232 [M+H]⁺

Preparation of Compound Examples:

Example 1 4-(Piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(1.50 g, 4.07 mmol) was dissolved in 4N HCl in dioxane (10 mL) andmethanol (5 mL) and irradiated with ultrasound for 5 min. The resultingsuspension was filtered, the residue was washed with dioxane (50 ml) andmethanol (2 mL) and dried for 16 h at 50° C. in vacuo to yield the titlecompound (1.35 g, 92% purity, 4.07 mmol, 100% of theory).

LC-MS (Method 2B): R_(t)=1.19 min, MS (ESIPos): m/z=269 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.57 (d, 2H), 7.41 (d-like, 2H), 7.00(quint-like, 1H), 6.26 (s, 1H), 3.67 (d, 2H), 3.53 (t, 1H), 3.31 (t,2H), 2.43 (d, 2H), 1.96 (qm, 2H).

Example 24-(Piperidin-4-yl)-9-(trifluoromethyl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-9-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate,48.3 mg, 0.111 mmol) was dissolved in 4N HCl in dioxane (1.2 mL),stirred for 5 min and evaporated in vacuo. Methanol (5 mL) was added andthe solution was evaporated again. The residue was dissolved in methanol(0.5 mL) and water (2 mL) and then lyophilized to give the titlecompound (38.7 mg, 94% of theory).

LC-MS (Method 1B): R_(t)=0.65 min, MS (ESIPos): m/z=337 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=13.55 (br. S, 1H), 8.91 (br. s, 1H), 8.74(br. S, 1H), 8.48 (s, 1H), 7.73 (d, 1H), 7.58 (d, 1H), 6.31 (s, 1H),3.79 (m, 1H), 3.43 (d, 2H), 3.17 (q, 2H), 2.30 (d, 2H), 1.92 (q, 2H).

Example 3 10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-chloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate,47.3 mg, 0.12 mmol) was dissolved in 4N HCl in dioxane (1.3 mL), stirredfor 5 min and evaporated in vacuo. Methanol (5 mL) was added and thesolution was evaporated again. The residue was dissolved in methanol(0.5 mL) and water (2 mL) and then lyophilized to give the titlecompound (40.5 mg, 0.12 mmol, 100% of theory).

LC-MS (Method 2B): R_(t)=1.36 min, MS (ESIPos): m/z=303 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.27 (d, 1H), 7.22 (dd, 1H), 6.85 (d, 1H), 6.34(s, 1H), 3.68 (d, 2H), 3.52 (t, 1H), 3.32 (t, 2H), 2.44 (d, 2H), 1.97(qm, 2H).

Example 4 10-Fluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-fluoro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(80 mg, 0.21 mmol) was dissolved in 4N HCl in dioxane (1 mL) andmethanol (1 mL) and irradiated with ultrasound for 15 min. The resultingsuspension was diluted with dioxane (2 mL), filtered, the residue waswashed with dioxane (2 ml) and dried for 16 h at 50° C. in vacuo toyield the title compound (64 mg, 95% of theory).

LC-MS (Method 2B): R_(t)=1.24 min, MS (ESIPos): m/z=287 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.39 (q, 1H), 7.28 (d, 1H), 6.70 (dd, 1H), 6.38(s, 1H), 3.72-3.59 (m, 3H), 3.31 (t, 2H), 2.46 (d, 2H), 1.99 (qm, 2H).

Example 5 9-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(9-chloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate,26.5 mg, 0.066 mmol) was dissolved in 4N HCl in dioxane (1 mL), stirredfor 1 min and evaporated in vacuo. Methanol (5 mL) was added and thesolution was evaporated again. The residue was dissolved in methanol(0.5 mL) and water (2 mL) and then lyophilized to give the titlecompound (24 mg, 0.07 mmol, 100% of theory).

LC-MS (Method 1B): R_(t)=0.59 min, MS (ESIPos): m/z=303 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.67 (s, 1H), 7.48 (d, 1H), 7.37 (d, 1H), 6.39(s, 1H), 3.72-3.62 (m, 3H), 3.32 (t, 2H), 2.48 (d, 2H), 2.00 (qm, 2H).

Example 67,9-Dichloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(8,10-dichloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(15.5 mg, 0.035 mmol) was dissolved in 4N HCl in dioxane (0.9 mL) andmethanol (0.1 mL), stirred for 30 min and evaporated in vacuo. Methanol(5 mL each) was added and the solution was evaporated two times to givethe title compound (13.4 mg, 0.04 mmol, 100% of theory).

LC-MS (Method 1B): R_(t)=0.61 min, MS (ESIPos): m/z=337 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆+TFA): δ=8.01 (d, J=1.8 Hz, 1H), 7.62 (d, J=1.8Hz, 1H), 6.41 (s, 1H), 3.81 (tm, 1H), 2.10 (dm, 2H), 3.23 (tm, 2H), 2.33(d, 2H), 1.91 (dq, 2H).

Example 7 9-Fluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(9-fluoro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(59 mg, 0.153 mmol) was dissolved in 4N HCl in dioxane (1 mL) andmethanol (1 mL) and irradiated with ultrasound for 15 min. The resultingsuspension was diluted with dioxane (2 mL) and filtered, the residue waswashed with dioxane (2 ml) and dried for 16 h at 50° C. in vacuo toyield the title compound (53 mg, 92% purity, 99% of theory).

LC-MS (Method 2B): R_(t)=1.29 min, MS (ESIPos): m/z=287 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.52 (dt, 1H), 7.34-7.25 (m, 2H), 6.34 (s, 1H),3.71-3.60 (m, 3H), 3.31 (t, 2H), 2.46 (d, 2H), 1.99 (qm, 2H).

Example 8 10-Methoxy-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-methoxy-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(120 mg, 0.30 mmol) was dissolved in 4N HCl in dioxane (2 mL) andmethanol (2 mL) and irradiated with ultrasound for 15 min. The resultingsuspension was diluted with dioxane (2 mL) and filtered, the residue waswashed with dioxane (2 ml) and dried for 16 h at 50° C. in vacuo toyield the title compound (102 mg, 98% purity, 99% of theory).

LC-MS (Method 2B): R_(t)=1.27 min, MS (ESIPos): m/z=299 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.32 (t, 1H), 6.92 (d, 1H), 6.30 (d, 1H), 6.23(s, 1H), 3.65 (d, 2H), 3.47 (t, 1H), 3.29 (t, 2H), 2.42 (d, 2H), 1.94(dm, 2H).

Example 97-(Piperidin-4-yl)pyrido[3′,2′:3,4]pyrazolo[1,5-a]pyrimidin-9(10H)-onehydrochloride

Tert-butyl4-(9-oxo-9,10-dihydropyrido[3′,2′:3,4]pyrazolo[1,5-a]pyrimidin-7-yl)piperidine-1-carboxylate(16 mg, 0.04 mmol) was dissolved in 4N HCl in dioxane (1 mL) andmethanol (1 mL) and irradiated with ultrasound for 15 min. The resultingsuspension was diluted with dioxane (2 mL) and filtered, the residue waswashed with dioxane (2 ml) and dried for 16 h at 50° C. in vacuo toyield the title compound (16 mg, 92% purity, 99% of theory).

LC-MS (Method 2B): R_(t)=1.07 min, MS (ESIPos): m/z=270 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=8.54 (d, 1H), 8.14 (d, 1H), 7.56 (dd, 1H), 6.51(s, 1H), 3.82 (t, 1H), 3.66 (d, 2H), 3.32 (t, 2H), 2.49 (d, 2H), 2.02(qm, 2H).

Example 10 10-Bromo-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-bromo-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(190 mg, 0.425 mmol) was dissolved in 4N HCl in dioxane (4 mL) andmethanol (4 mL) and irradiated with ultrasound for 15 min. The resultingsuspension was filtered, the residue was washed with dioxane (5 ml) anddried for 16 h at 50° C. in vacuo to yield the title compound (175 mg,93% purity, 99% of theory).

LC-MS (Method 2B): R_(t)=1.44 min, MS (ESIPos): m/z=347/349 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.40 (d, 1H), 7.22 (dd, 1H), 7.11 (d, 1H), 6.39(s, 1H), 3.67 (d, 2H), 3.60 (t, 1H), 3.32 (dd, 2H), 2.46 (d, 2H), 1.98(qm, 2H).

Example 114-(Piperidin-4-yl)-8-(trifluoromethyl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-8-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(353 mg, 0.810 mmol) was dissolved in methanol (8 mL), 4N HCl in dioxane(8 mL) was added and the mixture irradiated with ultrasound for 15 min.The resulting suspension was filtered, the residue was washed withdioxane (5 ml) and dried for 16 h at 50° C. in vacuo to yield the titlecompound (231 mg, 76% of theory).

LC-MS (Method 2B): R_(t)=1.61 min, MS (ESIPos): m/z=337 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.78 (s, 1H), 7.74 (d, 1H), 7.16 (d, 1H), 6.35(s, 1H), 3.68 (d, 2H), 3.63 (t, 1H), 3.32 (dd, 2H), 2.45 (d, 2H), 1.99(dm, 2H).

Example 124-(Piperidin-4-yl)-10-(trifluoromethyl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-(trifluoromethyl)-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(103 mg, 0.237 mmol) was dissolved in methanol (4 mL), 4N HCl in dioxane(4 mL) was added and the mixture irradiated with ultrasound for 15 min.The resulting suspension was diluted with methanol (2 mL), filtered, theresidue was washed with methanol (3 ml) and dried for 16 h at 50° C. invacuo to yield the title compound (90.6 mg, 97% purity, 99% of theory).

LC-MS (Method 2B): R_(t)=1.55 min, MS (ESIPos): m/z=337 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.80 (d, 1H), 7.58-7.49 (m, 2H), 6.48 (s, 1H),3.76 (t, 1H), 3.67 (d, 2H), 3.32 (dd, 2H), 2.47 (d, 2H), 2.00 (qm, 2H).

Example 138-tert-Butyl-4-(piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

Tert-butyl4-(8-tert-butyl-4-oxo-1,4-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2-yl)piperidine-1-carboxylate(64 mg, 0.152 mmol) was dissolved in methanol (2 mL), 4N HCl in dioxane(2 mL) was added and the mixture irradiated with ultrasound for 15 min.The resulting yellow solution was evaporated and the residue wastriturated with 4 mL dioxane/methanol (20:1), filtered and dried for 16h at 50° C. in vacuo to yield the title compound (51.4 mg, 90% purity,76% of theory).

LC-MS (Method 2B): R_(t)=1.57 min, MS (ESIPos): m/z=326 [M+H-xHCl]+

¹H-NMR (400 MHz, D₂O): δ=8.82 (d, 1H), 7.53 (d, 1H), 6.62 (s, 1H), 3.88(t, 1H), 3.66 (d, 2H), 3.33 (dd, 2H), 2.49 (d, 2H), 2.05 (qm, 2H), 1.54(s, 9H).

Example 1410-Methyl-4-(piperidin-4-yl)-8-(trifluoromethyl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

Tert-butyl4-(8-(trifluoromethyl)-4-oxo-1,4-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2-yl)piperidine-1-carboxylate(105 mg, 0.233 mmol) was dissolved in methanol (2 mL), 4N HCl in dioxane(2 mL) was added and the mixture irradiated with ultrasound for 15 min.The resulting suspension was filtered, the residue was washed withdioxane (5 ml) and dried for 16 h at 50° C. in vacuo to yield the titlecompound (71.8 mg, 72% of theory).

LC-MS (Method 1B): R_(t)=0.59 min, MS (ESIPos): m/z=352 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.49 (s, 1H), 6.63 (s, 1H), 3.85 (dt-like, 1H),3.67 (d, 2H), 3.34 (t, 2H), 2.77 (s, 3H), 2.50 (d, 2H), 2.05 (qm, 2H).

Example 15 9-Methyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(9-methyl-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(130 mg, 0.34 mmol) was dissolved in methanol (2 mL). 4N HCl in dioxane(2 mL) was added and the mixture was irradiated with ultrasound for 15min. The resulting suspension was diluted with methanol (2 mL),filtered, the residue was washed with dioxane (2 ml) and dried for 16 hat 50° C. in vacuo to yield the title compound (108 mg, 98% of theory).

LC-MS (Method 1B): R_(t)=0.55 min, MS (ESIPos): m/z=283 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.32-7.19 (m, 3H), 6.20 (br. S, 1H), 3.67 (d,2H), 3.48 (t-like, 1H), 3.30 (t, 2H), 2.41 (d, 2H), 2.32 (s, 3H), 1.94(qm, 2H).

Example 16 8-Amino-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(8-amino-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(23 mg, 0.06 mmol) was dissolved in methanol (0.5 mL). 4N HCl in dioxane(0.5 mL) was added and the mixture was irradiated with ultrasound for 15min. The resulting suspension was diluted with methanol (2 mL),filtered, the residue was washed with dioxane (2 ml) and dried for 16 hat 50° C. in vacuo to yield the title compound (14 mg, 64% of theory).

LC-MS (Method 1B): R_(t)=0.18 min, MS (ESIPos): m/z=284 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=7.91 (d, 1H), 6.96 (d, 1H), 6.38 (s, 1H),6.26 (s, 1H), 3.71 (t, 1H), 3.66 (d, 2H), 3.31 (dd, 2H), 2.47 (d, 2H),1.99 (qm, 2H).

Example 173,4-Dimethyl-8-(piperidin-4-yl)pyrimido[1′,2′:1,5]pyrazolo[3,4-c]pyridazin-6(5H)-onehydrochloride

Tert-butyl4-(3,4-dimethyl-8-oxo-5,8-dihydropyrimido[1′,2′:1,5]pyrazolo[3,4-c]pyridazin-6-yl)piperidine-1-carboxylate(55 mg, 0.128 mmol) was dissolved in methanol (1 mL). 4N HCl in dioxane(1 mL) was added and the mixture was irradiated with ultrasound for 15min. The resulting suspension was diluted with methanol (2 mL),filtered, the residue was washed with dioxane (2 ml) and dried for 16 hat 50° C. in vacuo to yield the title compound (43.6 mg, 85% of theory).

LC-MS (Method 2B): R_(t)=1.12 min, MS (ESIPos): m/z=299 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.02 (s, 1H), 3.86 (t-like, 1H), 3.68 (d, 2H),3.34 (dd, 2H), 3.06 (s, 3H), 2.81 (s, 3H), 2.51 (d, 2H), 2.08 (qm, 2H).

Example 18 8-Fluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(8-fluoro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(57.1 mg, 0.148 mmol) was dissolved in methanol (1 mL). 4N HCl indioxane (1 mL) was added and the mixture was irradiated with ultrasoundfor 15 min. The resulting suspension was diluted with methanol (2 mL),filtered, the residue was washed with dioxane (2 ml) and dried for 16 hat 50° C. in vacuo to yield the title compound (40.3 mg, 84% of theory).

LC-MS (Method 2B): R_(t)=1.30 min, MS (ESIPos): m/z=287 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.67 (dt, 1H), 7.05 (d, 1H), 6.82 (dt, 1H),6.29 (s, 1H), 3.62 (d, 2H), 3.58 (t-like, 1H), 3.26 (dd, 2H), 2.40 (d,2H), 1.93 (qm, 2H), 2 exchangeable protons not visible.

Example 19 9-Bromo-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(9-bromo-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(30 mg, 0.067 mmol) was dissolved in methanol (1 mL). 4N HCl in dioxane(1 mL) was added and the mixture was irradiated with ultrasound for 15min. The resulting suspension was filtered, the residue was washed withmethanol (0.5 mL) and dried for 16 h at 50° C. in vacuo to yield thetitle compound (11 mg, 42% of theory).

LC-MS (Method 2B): R_(t)=1.48 min, MS (ESIPos): m/z=347/349 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.83 (s, 1H), 7.48 (d, 1H), 7.42 (d, 1H), 6.40(s, 1H), 3.74-3.62 (m, 3H), 3.31 (t-like, 2H), 2.48 (d, 2H), 2.00 (qm,2H).

Example 20 10-Iodo-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-iodo-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(43 mg, 0.087 mmol) was dissolved in methanol (1 mL). 4N HCl in dioxane(1 mL) was added and the mixture was irradiated with ultrasound for 15min. The resulting suspension was diluted with methanol (2 mL),filtered, the residue was washed with dioxane (2 mL) and dried for 16 hat 50° C. in vacuo to yield the title compound (34 mg, 90% of theory).

LC-MS (Method 2B): R_(t)=1.52 min, MS (ESIPos): m/z=395 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.43 (d, 1H), 7.37 (d, 1H), 7.05 (dd, 1H), 6.43(s, 1H), 3.68 (d, 2H), 3.61 (t-like, 1H), 3.32 (dd, 2H), 2.46 (d, 2H),1.98 (qm, 2H).

Example 21 8-Bromo-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(8-bromo-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(85 mg, 0.190 mmol) was dissolved in methanol (1 mL). 4N HCl in dioxane(1 mL) was added and the mixture was irradiated with ultrasound for 15min. The resulting suspension was diluted with methanol (2 mL),filtered, the residue was washed with dioxane (2 mL) and dried for 16 hat 50° C. in vacuo to yield the title compound (58 mg, 78% of theory).

LC-MS (Method 2B): R_(t)=1.50 min, MS (ESIPos): m/z=347/349 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.50 (s, 1H), 7.39 (d, 1H), 6.94 (d, 1H), 6.37(s, 1H), 3.68 (d, 2H), 3.56 (t-like, 1H), 3.32 (dd, 2H), 2.47 (d, 2H),1.99 (qm, 2H).

Example 22 7-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(7-chloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(75 mg, 0.186 mmol) was suspended in methanol (1 mL). 4N HCl in dioxane(1 mL) was added and the mixture was irradiated with ultrasound for 30min. The resulting yellow suspension was diluted with methanol (2 mL),filtered, the residue was washed with 2 mL dioxane/methanol (1:1) anddried for 16 h at 50° C. in vacuo to yield the title compound (60 mg,95% of theory).

LC-MS (Method 2B): R_(t)=1.41 min, MS (ESIPos): m/z=303 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=13.49 (br. s, 1H), 8.80 (br. s, 1H), 8.56(br. s, 1H), 7.95 (d, 1H), 7.53 (d, 1H), 6.99 (dd, 1H), 6.28 (br. s,1H), 3.81 (br. s, 1H), 3.44 (d, 2H), 3.28-3.14 (m, 2H), 2.33 (d, 2H),1.90 (qm, 2H).

Example 238,10-Difluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(8,10-difluoro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate(26 mg, 0.064 mmol) was suspended in methanol (0.5 mL). 4N HCl indioxane (0.5 mL) was added and the mixture was irradiated withultrasound for 30 min. The resulting yellow suspension was filtered, theresidue was washed with dioxane (2 mL) and dried for 16 h at 50° C. invacuo to yield the title compound (13 mg, 95% purity, 57% of theory).

LC-MS (Method 2B): R_(t)=1.36 min, MS (ESIPos): m/z=305 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=12.79 (br. s, 1H), 8.91 (br. d, 1H), 8.74(br. d, 1H), 7.22 (d, 1H), 6.87 (dt, 1H), 6.66 (br. s, 1H), 3.85 (br. t,1H), 3.44 (d, 2H), 3.18 (dd, 2H), 2.31 (d, 2H), 1.94 (dm, 2H).

Example 248-Methyl-4-(piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

Tert-butyl4-(8-methyl-4-oxo-1,4-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2-yl)piperidine-1-carboxylate(50 mg, 0.130 mmol) was dissolved in methanol (1 mL). 4N HCl in dioxane(1 mL) was added and the mixture was irradiated with ultrasound for 15min. The resulting suspension was diluted with dioxane (2 mL), filtered,the residue was washed with dioxane (2 mL) and dried for 16 h at 50° C.in vacuo to yield the title compound (43 mg, 93% of theory).

LC-MS (Method 2B): R_(t)=1.12 min, MS (ESIPos): m/z=284 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=8.82 (d, 1H), 7.32 (d, 1H), 6.65 (s, 1H), 3.83(t-like, 1H), 3.65 (d, 2H), 3.31 (dd, 2H), 2.87 (s, 3H), 2.48 (d, 2H),2.04 (qm, 2H).

Example 253-Fluoro-7-(piperidin-4-yl)pyrido[3′,2′:3,4]pyrazolo[1,5-a]pyrimidin-9(10H)-onehydrochloride

Tert-butyl4-(3-fluoro-9-oxo-9,10-dihydropyrido[3′,2′:3,4]pyrazolo[1,5-a]pyrimidin-7-yl)piperidine-1-carboxylate(50.9 mg, 0.131 mmol) was dissolved in methanol (1 mL). 4N HCl indioxane (1 mL) was added and the mixture was irradiated with ultrasoundfor 15 min. The resulting suspension was diluted with dioxane (2 mL),filtered, the residue was washed with dioxane (2 mL) and dried for 16 hat 50° C. in vacuo to yield the title compound (38.9 mg, 82% of theory).

LC-MS (Method 2B): R_(t)=1.19 min, MS (ESIPos): m/z=270 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=8.42 (s, 1H), 7.69 (dd, 1H), 6.46 (s, 1H), 3.76(t-like, 1H), 3.66 (d, 2H), 3.31 (dd, 2H), 2.47 (d, 2H), 2.01 (qm, 2H).

Example 26 10-Ethoxy-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-ethoxy-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(135 mg, 0.327 mmol) was dissolved in methanol (2.5 mL). 4N HCl indioxane (2.5 mL) was added and the mixture was irradiated withultrasound for 15 min. The resulting suspension was diluted with dioxane(2 mL), filtered, the residue was washed with dioxane (2 mL) and driedfor 16 h at 50° C. in vacuo to yield the title compound (120 mg, 95%purity, 0.33 mmol, 100% of theory).

LC-MS (Method 2B): R_(t)=1.40 min, MS (ESIPos): m/z=313 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.35 (dd, 1H), 6.98 (d, 1H), 6.35 (d, 1H), 6.28(s, 1H), 4.23 (q, 2H), 3.66 (d, 2H), 3.54 (t-like, 1H), 3.30 (dd, 2H),2.44 (d, 2H), 1.96 (qm, 2H), 1.47 (t, 3H).

Example 277-Bromo-4-(piperidin-4-yl)pyrido[4′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

Tert-butyl4-(7-bromo-2-oxo-1,2-dihydropyrido[4′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(105 mg, 0.235 mmol) was dissolved in methanol (2 mL). 4N HCl in dioxane(2 mL) was added and the mixture was irradiated with ultrasound for 15min. The resulting suspension was diluted with dioxane (2 mL), filtered,the residue was washed with dioxane (2 mL) and dried for 16 h at 50° C.in vacuo to yield the title compound (90 mg, 91% of theory).

LC-MS (Method 2B): R_(t)=1.18 min, MS (ESIPos): m/z=350 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=12.88 (br. s, 1H), 9.29 (s, 1H), 9.02 (br.s, 1H), 8.92 (br. s, 1H), 8.32 (s, 1H), 6.98 (s, 1H), 3.95 (t-like, 1H),3.46 (d, 2H), 3.20 (dd, 2H), 2.34 (d, 2H), 2.01 (dq, 2H).

Example 28 7-Fluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(7-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(82.6 mg, 0.214 mmol) was dissolved in methanol (1 mL). 4N HCl indioxane (1 mL) was added and the mixture was irradiated with ultrasoundfor 15 min at 40° C. The resulting solution was evaporated in vacuo andtriturated with dioxane (2 mL), filtered, and dried for 16 h at 50° C.in vacuo to give the title compound (69.4 mg, 0.21 mmol, 100% of theory)as the yellowish hydrochloride salt.

LC-MS (Method 2B): R_(t)=1.30 min, MS (ESIPos): m/z=287 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.56 (d, 1H), 7.18 (dd, 1H), 7.01 (dt, 1H),6.39 (s, 1H), 3.74.3.62 (m, 3H), 3.33 (dd, 2H), 2.48 (d, 2H), 2.00 (qm,2H).

Example 294-(Piperidin-4-yl)pyrido[3′,4′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

Tert-butyl4-(2-oxo-1,2-dihydropyrido[3′,4′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(80.0 mg, 75% purity, 0.152 mmol) was dissolved in methanol (1 mL). 4NHCl in dioxane (1 mL) was added and the mixture was irradiated withultrasound for 15 min at 40° C. The resulting suspension was dilutedwith dioxane (2 mL), filtered, and dried for 16 h at 50° C. in vacuo togive the title compound (42.4 mg, 79% of theory).

LC-MS (Method 2B): R_(t)=1.04 min, MS (ESIPos): m/z=270 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=9.50 (s, 1H), 8.46 (d, 1H), 8.14 (d, 1H), 6.78(s, 1H), 3.93 (t-like, 1H), 3.67 (dd, 2H), 2.52 (d, 2H), 2.07 (qm, 2H).

Example 304-(Piperidin-4-yl)-7-(trifluoromethyl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-7-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(109 mg, 0.249 mmol) was dissolved in methanol (1 mL). 4N HCl in dioxane(2 mL) was added and the mixture was irradiated with ultrasound for 15min at 40° C. The resulting solution was evaporated in vacuo andtriturated with dioxane (2 mL), filtered, and dried for 16 h at 50° C.in vacuo to give the title compound (86 mg, 91% of theory).

LC-MS (Method 2B): R_(t)=1.62 min, MS (ESIPos): m/z=337 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.92 (d, 1H), 7.76 (d, 1H), 7.06 (dd, 1H), 6.38(s, 1H), 3.79 (t-like, 1H), 3.65 (d, 2H), 3.34 (dd, 2H), 2.46 (d, 2H),1.98 (qm, 2H).

Example 3110-Nitro-4-(piperidin-4-yl)-8-(trifluoromethyl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-nitro-2-oxo-8-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(80 mg, 0.166 mmol) was dissolved in methanol (1.3 mL). 4N HCl indioxane (1.3 mL) was added and the mixture was irradiated withultrasound for 15 min. The resulting suspension was diluted with dioxane(2 mL), filtered, and dried for 16 h at 50° C. in vacuo. The crudeproduct was again was dissolved in methanol (1 mL). 4N HCl in dioxane (1mL) was added and the mixture was irradiated with ultrasound for 15 min.The resulting suspension was evaporated in vacuo. Methanol (5 mL) wasadded and the solution was evaporated in vacuo. Methanol (5 mL) wasadded and the solution was evaporated in vacuo again to give the titlecompound (40 mg, 58% of theory).

LC-MS (Method 2B): R_(t)=1.71 min, MS (ESIPos): m/z=382 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=8.71 (s, 1H), 8.58 (s, 1H), 6.62 (s, 1H), 3.94(t-like, 1H), 3.68 (d, 2H), 3.36 (dd, 2H), 2.52 (d, 2H), 2.05 (qm, 2H).

Example 328,10-Dimethyl-4-(piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

Tert-butyl4-(8,10-dimethyl-4-oxo-1,4-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2-yl)piperidine-1-carboxylate(79.6 mg, 0.200 mmol) was dissolved in methanol (2 mL). 4N HCl indioxane (2 mL) was added and the mixture was irradiated with ultrasoundfor 15 min. The resulting suspension was diluted with methanol (2 mL),filtered, washed with methanol (3 mL) and dried for 16 h at 50° C. invacuo to give the title compound (65.2 mg, 88% of theory).

LC-MS (Method 2B): R_(t)=1.39 min, MS (ESIPos): m/z=298 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=6.89 (s, 1H), 6.38 (s, 1H), 3.62 (d, 2H),3.29-3.14 (3H), 2.86 (s, 3H), 2.71 (s, 3H), 2.33 (d, 2H), 2.04 (qm, 2H).

Example 332-Oxo-4-(piperidin-4-yl)-1,2-dihydropyrimido[1,2-b]indazole-10-carbonitriletrifluoroacetate

Tert-butyl4-(10-cyano-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(22 mg, 0.05 mmol) in dichloromethane (2 mL) was added TFA (0.1 mL) andthe mixture was stirred for 16 h at RT. The resulting solution wasevaporated in vacuo, dissolved in water (15 mL) and lyophilized to givethe title compound (20 mg, 86% of theory).

LC-MS (Method 2B): R_(t)=1.34 min, MS (ESIPos): m/z=294 [M+H-xTFA]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=12.62 (br. S, 1H), 8.75 (br. S, 1H), 8.44(br. S, 1H), 8.02 (d, 1H), 7.70 (d, 1H), 7.62 (dd, 1H), 6.82 (s, 1H),3.94 (t-like, 1H), 3.48 (d, 2H), 3.26-3.15 (m, 2H), 2.36 (d, 2H), 1.94(qm, 2H).

Example 34 7-Bromo-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(7-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(50.8 mg, 0.114 mmol) was dissolved in methanol (1.5 mL). 4N HCl indioxane (1.5 mL) was added and the mixture was irradiated withultrasound for 15 min. The resulting suspension was filtered, washedwith dioxane (2 mL) and dried for 16 h at 50° C. in vacuo to give thetitle compound (40.8 mg, 94% of theory).

LC-MS (Method 1B): R_(t)=0.52 min, MS (ESIPos): m/z=347 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.85 (d, 1H), 7.73 (d, 1H), 6.97 (dd, 1H), 6.40(s, 1H), 3.83 (t-like, 1H), 3.66 (d, 2H), 3.35 (dd, 2H), 2.51 (d, 2H),2.01 (qm, 2H).

Example 354-(Piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

Tert-butyl4-(2-oxo-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(35.9 mg, 0.087 mmol) was dissolved in methanol (1 mL). 4N HCl indioxane (1 mL) was added and the mixture was irradiated with ultrasoundfor 15 min at 40° C. The resulting suspension was filtered, washed withdioxane (2 mL) and dried for 16 h at 50° C. in vacuo to give the titlecompound (5.7 mg, 18% of theory).

LC-MS (Method 2B): R_(t)=0.97 min, MS (ESIPos): m/z=270 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=8.95-8.72 (m, 2H), 7.49-7.33 (m, 1H), 6.66 (s,1H), 3.85 (t-like, 1H), 3.66 (d, 2H), 3.32 (dd, 2H), 2.48 (d, 2H),2.16-1.95 (m, 2H).

Example 36 10-Methyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(54.1 mg, 0.141 mmol) was dissolved in methanol (1 mL). 4N HCl indioxane (1 mL) was added and the mixture was irradiated with ultrasoundfor 15 min at 40° C. The resulting suspension was filtered, washed withdioxane (2 mL) and dried for 16 h at 50° C. in vacuo to give the titlecompound (39.7 mg, 88% of theory).

LC-MS (Method 2B): R_(t)=1.35 min, MS (ESIPos): m/z=283 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.33-7.26 (m, 2H), 6.75-6.70 (m, 1H), 6.32 (s,1H), 3.67 (d, 2H), 3.60 (t-like, 1H), 3.32 (dd, 2H), 2.52 (s, 3H), 2.45(d, 2H), 1.97 (qm, 2H).

Example 374-(Piperidin-4-yl)-10-(trifluoromethoxy)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(trifluoromethoxy)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(52.3 mg, 0.116 mmol) was dissolved in methanol (2 mL). 4N HCl indioxane (2 mL) was added and the mixture was irradiated with ultrasoundfor 15 min at 40° C. The resulting suspension was filtered, washed withdioxane (2 mL) and dried for 16 h at 50° C. in vacuo to give the titlecompound (43.8 mg, 93% of theory).

LC-MS (Method 2B): R_(t)=1.60 min, MS (ESIPos): m/z=353 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.47-7.41 (m, 2H), 6.94 (br. s, 1H), 6.42 (s,1H), 3.73-3.62 (m, 3H), 3.31 (dd, 2H), 2.47 (d, 2H), 2.00 (qm, 2H).

Example 387-(Piperidin-4-yl)pyrazino[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-9(10H)-onehydrochloride

Tert-butyl4-(9-oxo-9,10-dihydropyrazino[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-7-yl)piperidine-1-carboxylate(78.2 mg, 0.211 mmol) was dissolved in methanol (2 mL). 4N HCl indioxane (2 mL) was added and the mixture was irradiated with ultrasoundfor 15 min at 40° C. The resulting suspension was filtered, washed withdioxane (2 mL) and dried for 16 h at 50° C. in vacuo to give the title(43.8 mg, 93% of theory).

LC-MS (Method 2B): R_(t)=0.87 min, MS (ESIPos): m/z=271 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=8.71 (br. s, 1H), 8.52 (br. s, 1H), 6.55 (br.s, 1H), 3.90-3.56 (m, 3H), 3.35 (br. s, 2H), 2.49 (br. s, 2H), 2.04 (br.s, 2H).

Example 39 8-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(8-chloro-4-oxo-1,4-dihydropyrimido[1,2-b]indazol-2-yl)piperidine-1-carboxylate,2.1 mg, 0.005 mmol) was dissolved in 4N HCl in dioxane (1 mL), stirredfor 1 min and evaporated in vacuo. Methanol (5 mL) was added and thesolution was evaporated again. The residue was dissolved in methanol(0.5 mL) and water (2 mL) and then lyophilized to give the titlecompound (2.0 mg, 0.005 mmol, 100% of theory).

¹H-NMR (400 MHz, D₂O): δ=7.44 (dd, 1H), 7.28 (d, 1H), 6.79 (d, 1H), 6.32(s, 1H), 3.68 (d, 2H), 3.51 (t, 1H), 3.32 (t, 2H), 2.45 (d, 2H), 1.98(q, 2H), 2 exchangeable protons not visible.

Example 4010-(Dimethylamino)-4-(piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

A solution of tert-Butyl4-[10-(dimethylamino)-2-oxo-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl]piperidine-1-carboxylate(8 mg, 0.02 mmol) in methanol (0.06 ml) was treated with HCl 4N indioxane (0.06 ml) and the reaction mixture was left without stirring for16 h at RT. The resulting precipitate was filtrated and dried undervacuo to yield the title compound (3.8 mg, 49% of theory).

LC-MS (Method 2B): R_(t)=1.21 min, MS (ESIPos): m/z=313 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.88 (d, 1H), 6.61 (s, 1H), 6.39 (d, 1H),3.75-3.48 (m, 9H), 3.30 (dd, 2H), 2.45 (d, 2H), 2.01 (dd, 2H).

Example 4110-Chloro-4-(piperidin-4-yl)-8-(trifluoromethyl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

A solution of tert-Butyl4-[10-chloro-2-oxo-8-(trifluoromethyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(83 mg, 0.18 mmol) in methanol (0.51 ml) was treated with HCl 4N indioxane (0.51 ml) and the reaction mixture was left without stirring for16 h at RT. The resulting precipitate was filtrated and dried undervacuo to yield the title compound (40 mg, 54% of theory).

LC-MS (Method 1B): R_(t)=0.67 min, MS (ESIPos): m/z=371[M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=12.75 (br. s, 1H), 9.06 (br. s, 1H), 8.04(s, 1H), 7.36 (s, 1H), 6.87 (br. s, 1H), 3.91 (dd, 1H), 3.45 (d, 2H),3.19 (dd, 2H), 2.34 (d, 2H), 2.00 (dd, 2H).

Example 428-(4-Fluorophenyl)-4-(piperidin-4-yl)-10-(trifluoromethyl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

A solution of tert-Butyl4-[8-(4-fluorophenyl)-2-oxo-10-(trifluoromethyl)-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl]piperidine-1-carboxylate(8 mg, 0.09 mmol) in methanol (0.26 ml) was treated with HCl 4N indioxane (0.26 ml) and the reaction mixture was left without stirring for16 h at RT. The resulting precipitate was filtrated and dried undervacuo (21 mg, 49% of theory).

LC-MS (Method 1B): R_(t)=0.74 min, MS (ESIPos): m/z=432 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=8.75 (br. s, 1H), 8.50 (br. s, 1H), 8.41(dd, 2H), 8.06 (s, 1H), 7.42 (dd, 2H), 6.88 (s, 1H), 3.96 (dd, 1H), 3.50(d, 2H), 3.24 (d, 2H), 2.40-2.33 (m, 2H), 1.98 (dd, 2H).

Example 4310-Bromo-4-(piperidin-4-yl)pyrido[3′,4′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

A suspension of tert-Butyl4-(10-bromo-2-oxo-1,2-dihydropyrido[3′,4′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(164 mg, 0.37 mmol) in methanol (3.0 ml) was treated with HCl 4N indioxane (3.0 ml) and then the reaction mixture was sonicated at RT for15 min. The resulting precipitate was filtrated, washed with dioxane anddried under vacuo 16 h at 50° C. to yield the title compound (143 mg,91% of theory).

LC-MS (Method 1B): R_(t)=0.33 min, MS (ESIPos): m/z=350 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.24 (s, 1H), 8.95 (br. s, 1H), 8.91 (br.s, 1H), 8.30 (s, 1H), 6.95 (s, 1H), 3.95 (dd, 1H), 3.20 (dd, 2H), 2.35(d, 2H), 1.98 (dd, 2H).

Example 448-Phenyl-4-(piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

A suspension of tert-Butyl4-(2-oxo-8-phenyl-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(91 mg, 0.20 mmol) in methanol (0.59 ml) was treated with HCl 4N indioxane (0.59 ml) and then the reaction mixture was left withoutstirring for 16 h at RT. The resulting precipitate was filtrated anddried under vacuo to yield the title compound (68 mg, 90% of theory).

LC-MS (Method 2B): R_(t)=1.55 min, MS (ESIPos): m/z=346 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=8.77 (br. s, 1H), 8.57 (br. s, 1H), 8.46(d. 1H), 8.20 (d, 1H), 7.73 (d, 1H), 7.57-7.52 (m, 3H), 6.34 (br. s,1H), 3.80 (br. s, 1H), 3.46 (d, 2H), 3.19 (dd, 2H), 2.35 (d, 2H), 1.94(dd, 1H).

Example 459-Phenyl-4-(piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

A suspension of tert-Butyl4-(2-oxo-9-phenyl-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(57 mg, 0.13 mmol) in methanol (0.37 ml) was treated with HCl 4N indioxane (0.37 ml) and then the reaction mixture was left withoutstirring for 16 h at RT. The resulting precipitate was filtrated anddried under vacuo to yield the title compound (45 mg, 93% of theory).

LC-MS (Method 2B): R_(t)=1.54 min, MS (ESIPos): m/z=346 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.08 (d, 1H), 8.95 (br. s, 1H), 8.75 (br.s, 1H), 8.65 (s, 1H), 7.74 (d, 2H), 7.54 (dd, 2H), 7.42 (dd, 1H), 6.43(br. s, 1H), 3.82 (dd, 1H), 3.46 (d, 2H), 3.20 (dd, 2H), 2.32 (d, 2H),1.96 (dd, 2H).

Example 4610-Phenyl-4-(piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

A suspension of tert-Butyl4-(2-oxo-10-phenyl-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(39 mg, 0.09 mmol) in methanol (0.25 ml) was treated with HCl 4N indioxane (0.25 ml) and then the reaction mixture was left withoutstirring at RT for 16 h. The resulting precipitate was filtrated anddried under vacuo to yield the title compound (32 mg, 97% of theory).

LC-MS (Method 2B): R_(t)=1.5 min, MS (ESIPos): m/z=346 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=8.66 (d, 1H), 7.76 (d, 2H), 7.62 (dd, 1H), 7.56(dd, 2H), 7.34 (d, 1H), 6.83 (s, 1H), 3.76 (dd, 1H), 3.61 (d, 2H), 3.26(dd, 2H), 2.38 (d, 2H), 1.99 (dd, 2H).

Example 4710-methyl-4-(piperidin-4-yl)pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

A suspension of tert-butyl4-(10-methyl-2-oxo-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(40 mg, 0.11 mmol) in methanol (0.30 ml) was treated with HCl 4N indioxane (0.30 ml) and then the reaction mixture was left withoutstirring for 16 h at RT. The resulting precipitate was filtrated anddried under vacuo to yield the title compound (27 mg, 81% of theory).

LC-MS (Method 2B): R_(t)=1.14 min, MS (ESIPos): m/z=284 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=8.52 (s, 1H), 7.23 (s, 1H), 6.88 (s, 1H),3.89-3.80 (m, 1H), 3.62 (m, 2H), 3.31 (s, 3H), 2.97-2.94 (m, 2H), 2.46(s, 2H), 2.08-1.98 (m, 2H).

Example 48 9-Iodo-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

A suspension of tert-Butyl4-(9-iodo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(83 mg, 0.17 mmol) in methanol (0.48 ml) was treated with HCl 4N indioxane (0.48 ml) and then the reaction mixture was left withoutstirring for 16 h at RT. The resulting precipitate was filtrated anddried under vacuo to yield the title compound: 77 mg (100% of theory).

LC-MS (Method 1B): R_(t)=0.59 min, MS (ESIPos): m/z=395 [M+H-xHCl]⁺

¹H-NMR (400 MHz, TFA): δ=8.85 (s, 1H), 8.53 (d, 1H), 7.94 (br. s, 1H),7.90 (d, 1H), 7.76 (br. s, 1H), 7.28 (s, 1H), 4.35 (dd, 1H), 4.20 (d,2H), 3.96 (dd, 2H), 2.91 (d, 2H), 2.68 (dd, 2H).

Example 494-(Piperidin-4-yl)pyrido[4′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-one

A suspension of compound tert-Butyl4-(2-oxo-1,2-dihydropyrido[4′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(100 mg, 0.27 mmol) in methanol (0.78 ml) was treated with HCl 4N indioxane (0.78 ml) and then the reaction mixture was left withoutstirring for 16 h at RT. The resulting precipitate was filtrated anddried under vacuo. The solid was diluted in small amount of water andtreated with ammonia. The resulting precipitate was filtrated and driedunder vacuo to yield the title compound (24 mg, 33% of theory).

LC-MS (Method 2B): R_(t)=1.03 min, MS (ESIPos): m/z=270 [M+H-xHCl]⁺

¹H-NMR (400 MHz, TFA): δ=9.98 (s, 1H), 8.50 (d, 1H), 8.28 (d, 1H), 7.91(br. s, 1H), 7.51 (br. s, 1H), 7.33 (s, 1H), 4.39 (dd, 1H), 4.19 (d,2H), 3.84 (dd, 2H), 2.93 (d, 2H), 2.65 (dd, 1H).

Example 50(−)-trans-10-Bromo-4-(2-methylpiperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

A suspension oftert-butyl-4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)-2-methylpiperidine-1-carboxylate(Example 74A, enantiomerically pure trans-Isomer) (1.07 g, 2.32 mmol) inmethanol (11.0 ml) was treated with HCl 4N in dioxane (11.0 ml). Thereaction mixture was sonicated at RT for 30 minutes. The mixture wasevaporated and the crude product was stirred in a mixture ofdioxane/methanol 1/1. The solid was filtered, washed with dioxane anddried overnight under vacuo at 70° C. After that the solid was dissolvedin water and lyophilized overnight to yield the title compound (373 mg,40% of theory).

LC-MS (Method 1B): R_(t)=0.58 min, MS (ESIPos): m/z=363 [M+H-xHCl]⁺

[α]²⁰=−13.16 (c. 0.380, methanol) WL=436 nm

¹H-NMR (400 MHz, DMSO-d₆): δ 12.40 (br. s, 1H), 9.38 (s, 1H), 8.99 (s,1H), 7.65 (d, 1H), 7.40-7.33 (m, 1H), 7.29 (d, 1H), 6.86 (s, 1H),4.12-4.01 (m, 1H), 3.41-3.26 (m, 1H), 3.25-3.14 (m, 1H), 2.34-2.20 (m,2H), 2.20-2.09 (m, 2H), 1.42 (d, 3H)

Example 51(−)-trans-4-(2-Methylpiperidin-4-yl)-10-phenylpyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-2(1H)-onehydrochloride

A suspension of tert-Butyl2-methyl-4-(2-oxo-10-phenyl-1,2-dihydropyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidin-4-yl)piperidine-1-carboxylate(Example 76A, enantiomerically pure trans-Isomer) (73 mg, 0.16 mmol) inmethanol (0.46 ml) was treated with HCl 4N in dioxane (0.46 ml). Thereaction mixture was left without stirring at RT for 16 h. The resultingsolid was filtered and washed with dioxane and finally dried under vacuoto yield the title compound (48 mg, 77% of theory).

LC-MS (Method 1B): R_(t)=0.50 min, MS (ESIPos): m/z=360 [M+H-xHCl]⁺

[α]²⁰=−26.80 (c. 0.49, methanol) WL=589 nm

¹H-NMR (400 MHz, DMSO-d₆): δ 9.21 (br. s, 1H), 8.87 (d, 1H), 8.00-7.89(m, 2H), 7.65-7.55 (m, 3H), 7.32-7.31 (m, 1H), 7.05-6.95 (m, 1H),4.14-4.03 (m, 1H), 3.76-3.66 (m, 1H), 3.41-3.30 (m, 1H), 3.28-3.18 (m,1H), 2.34-2.11 (m, 4H), 1.44 (s, 3H).

Example 52(−)-trans-10-Ethoxy-4-(2-methylpiperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

A suspension of tert-butyl4-(10-ethoxy-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)-2-methylpiperidine-1-carboxylate(Example 75A, enantiomerically pure trans-Isomer) (90 mg, 0.21 mmol) inmethanol (0.61 ml) was treated with HCl 4N in dioxane (0.61 ml). Thereaction mixture was left without stirring at RT for 16 h. The mixturewas evaporated and the residue was sonicated in dioxane. The salt wasfiltered, washed with dioxane and dried overnight under vacuo to yieldthe title compound (66 mg, 85% of theory).

LC-MS (Method 1B): R_(t)=0.54 min, MS (ESIPos): m/z=327 [M+H-xHCl]⁺

[α]²⁰=−6.420 (c. 0.405, methanol) WL=578 nm

¹H-NMR (400 MHz, DMSO-d₆): δ 9.00 (br. s, 1H), 8.71 (br. s, 1H), 7.28(t, 1H), 7.04 (d, 1H), 6.35 (d, 1H), 4.24 (q, 2H), 3.74-3.65 (br. s,1H), 3.35-3.19 (m, 2H), 2.30-2.00 (m, 4H), 1.15 (t, 3H), 1.40 (d, 3H).

Example 532-Oxo-4-(piperidin-4-yl)-1,2-dihydropyrimido[1,2-b]indazole-10-carbonitrilehydrochloride

Tert-butyl4-(10-cyano-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(320 mg, 0.81 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 2.0 mL, 8.1 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (275 mg, 92% oftheory).

LC-MS (Method 1B): R_(t)=0.46 min, MS (ESIPos): m/z=294 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=12.65 (br. s, 1H), 9.13-8.70 (m, 2H), 8.03(d, 1H), 7.71 (d, 1H), 7.62 (dd, 1H), 6.85 (s, 1H), 4.00-3.86 (m, 1H),3.45 (d, 2H), 3.20 (d, 2H), 2.35 (d, 2H), 1.99 (d, 2H).

Example 5410-(4-Methoxyphenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl-4-[10-(4-methoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidin-1-carboxylat(312 mg, 0.66 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.6 mL, 6.6 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane and diethyl ether to afford the title compound(244 mg, 78% of theory).

LC-MS (Method 1B): R_(t)=0.70 min, MS (ESIPos): m/z=375 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.04-8.77 (m, 2H), 7.64 (d, 2H), 7.59 (d,1H), 7.49 (dd, 1H), 7.05 (d, 2H), 6.95 (d, 1H), 6.63 (br. s, 1H), 3.57(s, 3H), 3.46 (d, 2H), 3.21 (d, 2H), 2.36 (d, 2H), 1.98 (d, 2H).

Example 554-(Piperidin-4-yl)-10-[4-(trifluoromethyl)phenyl]pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-{2-oxo-10-[4-(trifluoromethyl)phenyl]-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate(180 mg, 0.35 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.9 mL, 3.5 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane and diethyl ether to afford the title compound(144 mg, 84% of theory).

LC-MS (Method 1B): R_(t)=0.80 min, MS (ESIPos): m/z=413 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.06-8.81 (m, 2H), 7.94 (d, 2H), 7.83 (d,2H), 7.71 (d, 1H), 7.57 (dd, 1H), 7.09 (d, 1H), 6.68 (br. s, 1H), 3.46(d, 2H), 3.22 (d, 2H), 2.36 (d, 2H), 1.99 (dd, 2H).

Example 56 10-Phenyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(2-oxo-10-phenyl-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(470 mg, 1.06 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 2.6 mL, 10.6 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane and diethyl ether to afford the title compound(375 mg, 85% of theory).

LC-MS (Method 1B): R_(t)=0.69 min, MS (ESIPos): m/z=345 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.07 (br. s., 2H), 7.83-7.59 (m, 3H),7.58-7.33 (m, 4H), 7.00 (d, 1H), 6.66 (br. s., 1H), 4.07-3.85 (m, 1H),3.45 (d, 2H), 3.21 (d, 2H), 2.36 (d, 2H), 2.00 (d, 2H).

Example 5710-(2-Fluorophenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(2-fluorophenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(590 mg, 1.28 mmol) was dissolved in 1,4-dioxane (5 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 3.2 mL, 12.8 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane and diethyl ether to afford the title compound(501 mg, 90% of theory).

LC-MS (Method 1B): R_(t)=0.62 min, MS (ESIPos): m/z=363 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.02 (br. s., 2H), 7.69 (d, 1H), 7.61-7.44(m, 3H), 7.40-7.23 (m, 2H), 6.98 (d, 1H), 6.67 (br. s., 1H), 4.04-3.87(m, 1H), 3.45 (d, 2H), 3.21 (d, 2H), 2.36 (d, 2H), 1.99 (dd, 2H).

Example 584-(Piperidin-4-yl)-10-(pyridin-3-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(pyridin-3-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(450 mg, 1.01 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 2.5 mL, 10.1 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane and diethyl ether to afford the title compound(349 mg, 83% of theory).

LC-MS (Method 1B): R_(t)=0.36 min, MS (ESIPos): m/z=346 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.27 (s, 1H), 9.06 (br. s., 1H), 8.98 (d,1H), 8.91-8.80 (m, 1H), 8.13 (dd, 1H), 7.81 (d, 1H), 7.64 (dd, 1H), 7.24(d, 1H), 6.75 (br. s, 1H), 4.04-3.90 (m, 1H), 3.46 (d, 2H), 3.31-3.10(m, 2H), 2.35 (d, 2H), 2.09-1.87 (m, 2H)

Example 594-(Piperidin-4-yl)-10-(pyridin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(pyridin-4-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(33 mg, 0.07 mmol) was dissolved in 1,4-dioxane (1 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.3 mL, 0.74 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane. The residue was dissolved in methanol andconcentrated in vacuo to afford the title compound (30 mg, 97% oftheory).

LC-MS (Method 1B): R_(t)=0.25 min, MS (ESIPos): m/z=346 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=8.85 (d, 2H), 8.19 (d, 2H), 7.81 (d, 1H), 7.66(dd, 1H), 7.32 (d, 1H), 6.53 (s, 1H), 3.80 (t, 1H), 3.69 (d, 2H), 3.35(dd, 2H), 2.50 (d, 2H), 2.10-1.96 (m, 2H)

Example 60 10-Bromo-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-bromo-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(860 mg, 1.92 mmol) was dissolved in 1,4-dioxane (20 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 4.8 mL, 19.2 mmol).The mixture was stirred at RT for 16 h. The resulting solid was filteredand washed with 1,4-dioxane to afford the title compound (805 mg, 100%of theory).

LC-MS (Method 3B): R_(t)=1.40 min, MS (ESIPos): m/z=349 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=8.97-8.65 (m, 1H), 7.65 (d, 1H), 7.37 (dd,1H), 7.31 (d, 1H), 6.75 (br. s, 1H), 3.50-3.39 (m, 2H), 3.28-3.11 (m,2H), 2.40-2.27 (m, 2H), 2.04-1.88 (m, 2H).

Example 6110-Cyclopropyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-cyclopropyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(25 mg, 0.06 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.15 mL, 0.61 mmol). Themixture was stirred at RT for 72 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (22 mg, 94% oftheory).

LC-MS (Method 1B): R_(t)=0.57 min, MS (ESIPos): m/z=309 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.36-7.26 (m, 2H), 6.72-6.65 (m, 1H), 6.40-6.35(m, 1H), 3.72-3.57 (m, 3H), 3.39-3.25 (m, 2H), 2.51-2.39 (m, 2H),2.24-2.15 (m, 1H), 2.06-1.88 (m, 2H), 1.15-1.03 (m, 2H), 0.76-0.69 (m,2H).

Example 6210-Isopropyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-isopropyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(33 mg, 0.08 mmol) was dissolved in 1,4-dioxane (1 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.2 mL, 0.80 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (30 mg, 97% oftheory).

LC-MS (Method 2B): R_(t)=1.63 min, MS (ESIPos): m/z=311 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.01-8.67 (m, 2H), 7.44 (s, 2H), 6.94 (d,1H), 6.66 (br. s, 1H), 3.51-3.39 (m, 2H), 3.30-3.11 (m, 2H), 2.41-2.29(m, 2H), 2.06-1.88 (m, 2H), 1.35 (d, 6H).

Example 6310-Cyclopentyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-cyclopentyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(23 mg, 0.05 mmol) was dissolved in 1,4-dioxane (1 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.1 mL, 0.53 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (21 mg, 97% oftheory).

LC-MS (Method 1B): R_(t)=0.68 min, MS (ESIPos): m/z=337 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=8.94-8.80 (m, 1H), 8.78-8.57 (m, 1H),7.47-7.32 (m, 2H), 6.94 (d, 1H), 6.64 (br. s, 1H), 4.28-4.08 (m, 1H),4.01-3.86 (m, 1H), 3.77-3.62 (m, 3H), 3.28-3.11 (m, 2H), 2.42-2.29 (m,2H), 2.25-2.07 (m, 2H), 2.05-1.59 (m, 7H)

Example 6410-(2-Chlorophenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(2-chlorophenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(300 mg, 0.63 mmol) was dissolved in 1,4-dioxane (12 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 1.6 mL, 6.26 mmol).The mixture was stirred at RT for 16 h. The resulting solid was filteredand washed with 1,4-dioxane to afford the title compound (220 mg, 78% oftheory).

LC-MS (Method 1B): R_(t)=0.70 min, MS (ESIPos): m/z=379 [M+H-xHCl]⁺

¹H-NMR (500 MHz, DMSO-d₆): δ=9.24-9.06 (m, 1H), 7.69 (d, 1H), 7.58 (d,1H), 7.54 (dd, 1H), 7.50-7.41 (m, 3H), 6.89 (d, 1H), 6.66 (br. s., 1H),3.95 (t, 1H), 3.45 (d, 2H), 3.27-3.13 (m, 2H), 2.36 (d, 2H), 2.01 (d,2H).

Example 6510-(2-Methoxyphenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(2-methoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(200 mg, 0.42 mmol) was dissolved in 1,4-dioxane (8 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.1 mL, 4.21 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (22 mg, 12% oftheory).

LC-MS (Method 1B): R_(t)=0.66 min, MS (ESIPos): m/z=375 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.51 (br. s., 3H), 7.29-6.96 (m, 3H), 6.83 (br.s., 1H), 6.35 (br. s., 1H), 3.33 (br. s., 2H), 2.43 (br. s., 2H), 1.99(br. s., 2H)

Example 66 10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one

10-chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride (4.00 g, 11.8 mmol) was dissolved in hydrochloric acid(1.0 M in water) and treated with sodium hydroxide solution (1.0 M inwater). The precipitate was collected by filtration, washed with water,and dried under vacuo to afford the title compound (3.05 g, 85% oftheory).

LC-MS (Method 1B): R_(t)=0.47 min, MS (ESIPos): m/z=303 [M+H]⁺

¹H-NMR (500 MHz, DCOOD): δ=7.50 (d, 1H), 7.41-7.33 (m, 1H), 7.05 (d,1H), 6.58 (s, 1H), 3.83 (t, 1H), 3.76 (d, 2H), 3.39 (dd, 2H), 2.47 (d,2H), 2.16-2.02 (m, 2H).

Example 674-(Piperidin-4-yl)-10-[2-(trifluoromethyl)phenyl]pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-{2-oxo-10-[2-(trifluoromethyl)phenyl]-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate(200 mg, 0.39 mmol) was dissolved in 1,4-dioxane (8 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.0 mL, 3.90 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (102 mg, 54% oftheory).

LC-MS (Method 1B): R_(t)=0.73 min, MS (ESIPos): m/z=413 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.95 (s, 1H), 7.72 (s, 2H), 7.64 (d, 1H), 7.52(br. s, 1H), 7.29 (br. s, 1H), 6.90 (br. s, 1H), 6.36 (s, 1H), 3.77 (t,1H), 3.66 (d, 2H), 3.32 (dd, 2H), 2.44 (d, 2H), 2.06-1.89 (m, 2H).

Example 68(−)-trans-10-Chloro-4-(2-methylpiperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

A suspension of tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)-2-methylpiperidine-1-carboxylate(Example 49A, enantiomerically pure trans-Isomer) (270 mg, 0.65 mmol) inmethanol (1.8 ml) was treated with HCl 4N in dioxane (1.8 ml). Thereaction mixture was left at RT without stirring for 16 h. The mixturewas evaporated and the crude product was stirred in dioxane. The solidwas filtered, washed with dioxane and dried overnight under vacuo at 60°C. After that the solid was dissolved in water and methanol andlyophilized overnight to yield the title compound (117 mg, 77% oftheory).

LC-MS (Method 1B): RT=0.53 min, MS (ESIPos): m/z=317 [M+H-xHCl]⁺

[α]²⁰=−3.04 (c. 0.46, methanol) WL=589 nm

¹H-NMR (400 MHz, DMSO-d₆): δ 12.44 (br. s, 1H), 9.22 (br. s, 1H), 8.87(br. s, 1H), 7.60 (d, 1H), 7.73 (t, 1H), 7.10 (d, 1H), 6.86 (br. s, 1H),4.13-3.97 (m, 1H), 3.76-3.64 (m, 1H), 3.26-3.12 (m, 1H), 2.35-2.20 (m,2H), 2.21-2.06 (m, 2H), 1.42 (d, 3H).

Example 6910-Chloro-9-methyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-chloro-9-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(220 mg, 0.53 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.3 mL, 5.3 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (182 mg, 89% oftheory).

LC-MS (Method 1B): R_(t)=0.52 min, MS (ESIPos): m/z=317 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.10-8.80 (m, 2H), 7.53 (d, 1H), 7.42 (d,1H), 6.64 (br. s, 1H), 3.97-3.81 (m, 1H), 3.44 (d, 1H), 3.18 (dd, 2H),2.42 (s, 2H), 2.33 (d, 2H), 2.06-1.86 (m, 2H).

Example 7010-Bromo-9-fluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-bromo-9-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(376 mg, 0.81 mmol) was dissolved in 1,4-dioxane (3 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 2.0 mL, 8.1 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (350 mg, 99% oftheory).

LC-MS (Method 1B): R_(t)=0.51 min, MS (ESIPos): m/z=365 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.14-8.87 (m, 1H), 7.73 (dd, 1H), 7.53 (dd,1H), 6.78 (br. s., 1H), 3.44 (d, 2H), 3.18 (d, 2H), 2.33 (d, 2H), 1.99(d, 2H).

Example 7110-Bromo-7-fluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-bromo-7-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(424 mg, 0.91 mmol) was dissolved in 1,4-dioxane (3 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 2.3 mL, 9.1 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with methanol and 1,4-dioxane to afford the title compound (330mg, 83% of theory).

LC-MS (Method 1B): R_(t)=0.52 min, MS (ESIPos): m/z=365 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=12.69-12.49 (m, 1H), 8.91 (br. s, 1H), 8.70(br. s, 1H), 7.32-7.17 (m, 2H), 6.84 (br. s, 1H), 4.04-3.88 (m, 1H),3.45 (d, 2H), 3.29-3.14 (m, 2H), 2.34 (d, 2H), 2.06-1.88 (m, 2H).

Example 7210-sec-Butyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-sec-butyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(27 mg, 0.06 mmol) was dissolved in 1,4-dioxane (1 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.2 mL, 0.64 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with methanol and 1,4-dioxane to afford the title compound (26mg, 100% of theory).

LC-MS (Method 1B): R_(t)=0.70 min, MS (ESIPos): m/z=325 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.04-8.93 (m, 1H), 8.91-8.76 (m, 1H),7.50-7.35 (m, 2H), 6.91 (d, 1H), 6.66 (br. s, 1H), 4.00-3.87 (m, 2H),3.45 (d, 2H), 3.22 (br. s., 2H), 2.35 (d, 2H), 2.06-1.90 (m, 2H),1.89-1.62 (m, 2H), 1.32 (d, 3H), 0.85 (t, 3H).

Example 7310-Isobutyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-isobutyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(92 mg, 0.22 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.6 mL, 2.2 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with methanol and 1,4-dioxane to afford the title compound (85mg, 99% of theory).

LC-MS (Method 2B): R_(t)=1.73 min, MS (ESIPos): m/z=325 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.07-8.80 (m, 1H), 7.45 (d, 1H), 7.37 (dd,1H), 6.80 (d, 1H), 6.66 (br. s., 1H), 3.45 (d, 2H), 3.20 (d, 2H), 3.08(d, 2H), 2.35 (d, 2H), 2.14-2.05 (m, 1H), 1.98 (dd, 2H), 0.94 (d, 6H).

Example 7410-Bromo-9-methyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-bromo-9-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(220 mg, 0.48 mmol) was treated with hydrochloric acid (4 M solution in1,4-dioxane, 20.0 mL, 80 mmol). The mixture was stirred at RT for 16 h.The resulting solid was filtered and washed with methanol and1,4-dioxane to afford the title compound (184 mg, 97% of theory).

LC-MS (Method 1B): R_(t)=0.56 min, MS (ESIPos): m/z=361 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.09-8.79 (m, 2H), 7.58 (d, 1H), 7.43 (d,1H), 6.70 (s, 1H), 3.99-3.83 (m, 1H), 3.44 (d, 2H), 3.18 (d, 2H), 2.46(s, 3H), 2.33 (d, 2H), 1.97 (d, 2H).

Example 7510-Bromo-7-methyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-bromo-7-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(220 mg, 0.48 mmol) was treated with hydrochloric acid (4 M solution in1,4-dioxane, 20.0 mL, 80 mmol). The mixture was stirred at RT for 16 h.The resulting solid was filtered and washed with methanol and1,4-dioxane to afford the title compound (145 mg, 76% of theory).

LC-MS (Method 1B): R_(t)=0.62 min, MS (ESIPos): m/z=361 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=8.97-8.84 (m, 1H), 8.83-8.66 (m, 1H),7.23-7.13 (m, 2H), 6.74 (s, 1H), 3.99-3.86 (m, 1H), 3.46 (d, 2H),3.30-3.12 (m, 2H), 2.53 (br. s., 3H), 2.38 (d, 2H), 2.06-1.89 (m, 2H).

Example 7610-Isopropoxy-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-isopropoxy-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(134 mg, 0.31 mmol) was dissolved in 1,4-dioxane (5 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 3.6 mL, 14.4 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with methanol and 1,4-dioxane to afford the title compound (125mg, 99% of theory).

LC-MS (Method 1B): R_(t)=1.55 min, MS (ESIPos): m/z=327 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.35 (dd, 1H), 6.97 (d, 1H), 6.39 (d, 1H), 6.27(s, 1H), 4.83-4.76 (m, 1H), 3.70-3.62 (m, 2H), 3.58-3.49 (m, 1H),3.35-3.26 (m, 2H), 2.47-2.39 (m, 2H), 2.01-1.90 (m, 2H), 1.45 (d, 6H).

Example 779-Fluoro-10-phenyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(9-fluoro-2-oxo-10-phenyl-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(67 mg, 0.15 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.6 mL, 6.7 mmol). Themixture was stirred at RT for 4 h. The resulting solid was filtered andwashed with methanol and 1,4-dioxane to afford the title compound (62mg, 98% of theory).

LC-MS (Method 2B): R_(t)=1.70 min, MS (ESIPos): m/z=363 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.56 (dd, 3H), 7.49 (dd, 1H), 7.34-7.26 (m,3H), 6.32 (s, 1H), 3.69-3.59 (m, 3H), 3.33-3.23 (m, 2H), 2.39-2.29 (m,2H), 1.98-1.85 (m, 2H).

Example 7810-(2,6-Difluorophenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(2,6-difluorophenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(105 mg, 0.22 mmol) was treated with hydrochloric acid (4 M solution in1,4-dioxane, 20.0 mL, 80.0 mmol). The mixture was stirred at RT for 16h. The resulting solid was filtered and washed with methanol and1,4-dioxane to afford the title compound (66 mg, 73% of theory).

LC-MS (Method 1B): R_(t)=0.67 min, MS (ESIPos): m/z=381 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.59 (br. s, 1H), 7.54-7.37 (m, 2H), 7.09 (br.s, 2H), 6.89 (br. s, 1H), 6.39 (s, 1H), 3.73-3.59 (m, 3H), 3.37-3.24 (m,2H), 2.43-2.28 (m, 2H), 2.02-1.86 (m, 2H).

Example 7910-Chloro-8-methyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-chloro-8-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(320 mg, 0.77 mmol) was dissolved in 1,4-dioxane (10 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 8.8 mL, 35.3 mmol).The mixture was stirred at RT for 4 h. The resulting solid was filteredand washed with methanol and 1,4-dioxane to afford the title compound(290 mg, 97% of theory).

LC-MS (Method 2B): R_(t)=1.50 min, MS (ESIPos): m/z=317 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=6.95 (s, 1H), 6.64 (s, 1H), 6.27 (s, 1H), 3.68(d, 2H), 3.56-3.47 (m, 1H), 3.37-3.25 (m, 2H), 2.43 (d, 2H), 2.25 (s,3H), 2.03-1.91 (m, 2H).

Example 804-(Piperidin-4-yl)-10-[2-(trifluoromethoxy)phenyl]pyrimido[1,2-b]indazol-2(1H)-onhydrochloride

Tert-butyl4-{2-oxo-10-[2-(trifluoromethoxy)phenyl]-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate(107 mg, 0.20 mmol) was dissolved in 1,4-dioxane (5 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 5.0 mL, 20.0 mmol). Themixture was stirred at RT for 16 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (70 mg, 74% oftheory).

LC-MS (Method 1B): R_(t)=0.73 min, MS (ESIPos): m/z=429 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=11.81 (br. s, 1H), 8.93-8.71 (m, 1H),8.70-8.48 (m, 1H), 7.72-7.45 (m, 6H), 6.94 (d, 1H), 6.63 (br. s, 1H),4.06-3.87 (m, 1H), 3.51-3.39 (m, 2H), 3.32-3.12 (m, 2H), 2.43-2.28 (m,2H), 2.04-1.84 (m, 2H).

Example 8110-Bromo-8-fluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-bromo-8-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(23 mg, 0.05 mmol) was dissolved in 1,4-dioxane (1 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.6 mL, 2.3 mmol). Themixture was stirred at RT for 4 h. Concentration in vacuo afforded thetitle compound (21 mg, 97% of theory).

LC-MS (Method 1B): R_(t)=0.57 min, MS (ESIPos): m/z=365 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.03-8.75 (m, 1H), 7.42 (dd, 1H), 7.31 (dd,1H), 6.77 (br. s, 1H), 3.96-3.83 (m, 1H), 3.45 (d, 2H), 3.26-3.10 (m,2H), 2.32 (d, 2H), 2.05-1.87 (m, 2H).

Example 824-(Piperidin-4-yl)-10-(pyridin-2-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(pyridin-2-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(339 mg, 0.76 mmol) was dissolved in 1,4-dioxane (5 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 3.8 mL, 15.2 mmol). Themixture was stirred at RT for 4 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (306 mg, 96% oftheory).

LC-MS (Method 1B): R_(t)=0.59 min, MS (ESIPos): m/z=346 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=8.89 (br. s., 3H), 8.40 (d, 1H), 8.27-8.15(m, 1H), 7.87-7.80 (m, 1H), 7.79-7.64 (m, 2H), 7.56 (dd, 1H), 6.40 (s,1H), 3.91-3.80 (m, 1H), 3.43 (d, 2H), 3.26-3.11 (m, 2H), 2.31 (d, 2H),2.04-1.88 (m, 2H).

Example 834-(Piperidin-4-yl)-10-(1,3-thiazol-2-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(1,3-thiazol-2-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(279 mg, 0.62 mmol) was dissolved in 1,4-dioxane (5 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 3.8 mL, 15.2 mmol). Themixture was stirred at RT for 4 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (259 mg, 99% oftheory).

LC-MS (Method 1B): R_(t)=0.61 min, MS (ESIPos): m/z=352 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=13.64 (br. s, 1H), 9.13-8.67 (m, 2H), 8.22(d, 1H), 8.01 (d, 1H), 7.78-7.70 (m, 2H), 7.51 (dd, 1H), 6.34 (s, 1H),3.87-3.76 (m, 1H), 3.44 (d, 2H), 3.26-3.10 (m, 2H), 2.32 (d, 2H), 1.96(d, 2H).

Example 844-(Piperidin-4-yl)-10-(3-thienyl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(3-thienyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(98 mg, 0.22 mmol) was dissolved in 1,4-dioxane (8 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.1 mL, 4.4 mmol). Themixture was stirred at RT for 4 h. The resulting solid was filtered andwashed with 1,4-dioxane to afford the title compound (34 mg, 40% oftheory).

LC-MS (Method 1B): R_(t)=0.61 min, MS (ESIPos): m/z=351 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.59 (br. s, 1H), 7.34 (br. s., 1H), 7.30-7.20(m, 2H), 7.05 (br. s, 1H), 6.81-6.72 (m, 1H), 6.23 (br. s., 1H), 3.64(d, 2H), 3.48-3.37 (m, 1H), 3.31-3.15 (m, 2H), 2.28 (d, 2H), 1.97-1.79(m, 2H).

Example 8510-(2-Methylphenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(2-methylphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(150 mg, 0.33 mmol) was dissolved in 1,4-dioxane (13 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 1.6 mL, 6.5 mmol).The mixture was stirred at RT for 4 h. Concentration in vacuo affordedthe title compound (123 mg, 95% of theory).

LC-MS (Method 1B): R_(t)=0.67 min, MS (ESIPos): m/z=359 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.58 (d, 1H), 7.54-7.48 (m, 1H), 7.47-7.39 (m,2H), 7.30 (t, 1H), 7.09 (d, 1H), 6.78 (d, 1H), 6.35 (s, 1H), 3.87-3.62(m, 3H), 3.37-3.27 (m, 2H), 2.48-2.38 (m, 2H), 2.00 (s, 5H).

Example 8610-(1-Methyl-1H-pyrazol-5-yl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(1-methyl-1H-pyrazol-5-yl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(140 mg, 0.31 mmol) was dissolved in 1,4-dioxane (6 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 3.6 mL, 14.4 mmol). Themixture was stirred at RT for 4 h. Concentration in vacuo afforded thetitle compound (110 mg, 92% of theory).

LC-MS (Method 1B): R_(t)=0.52 min, MS (ESIPos): m/z=349 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.85 (d, 1H), 7.71 (d, 1H), 7.59 (dd, 1H), 7.10(d, 1H), 6.56 (d, 1H), 6.47 (s, 1H), 3.79 (s, 4H), 3.69 (d, 2H),3.39-3.30 (m, 2H), 2.47 (d, 2H), 2.07-1.95 (m, 2H).

Example 8710-(1-Methyl-1H-pyrazol-4-yl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(1-methyl-1H-pyrazol-4-yl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(121 mg, 0.27 mmol) was dissolved in 1,4-dioxane (6 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 3.1 mL, 12.4 mmol). Themixture was stirred at RT for 4 h. Concentration in vacuo afforded thetitle compound (128 mg, 99% of theory).

LC-MS (Method 1B): R_(t)=0.53 min, MS (ESIPos): m/z=349 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.93 (s, 1H), 7.79 (s, 1H), 7.05 (dd, 1H), 6.97(d, 1H), 6.57 (d, 1H), 6.24 (s, 1H), 3.89 (s, 3H), 3.71 (d, 2H),3.33-3.24 (m, 2H), 3.24-3.15 (m, 1H), 2.26 (d, 2H), 1.92-1.80 (m, 2H).

Example 884-(Piperidin-4-yl)-10-(2-thienyl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(2-thienyl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(101 mg, 0.22 mmol) was dissolved in 1,4-dioxane (5 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 2.6 mL, 10.3 mmol). Themixture was stirred at RT for 4 h. Concentration in vacuo afforded thetitle compound (85 mg, 98% of theory).

LC-MS (Method 1B): R_(t)=0.66 min, MS (ESIPos): m/z=351 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.51 (d, 1H), 7.28 (d, 1H), 7.23 (dd, 1H), 7.16(dd, 1H), 7.08 (d, 1H), 6.82 (d, 1H), 6.23 (s, 1H), 3.59 (d, 2H),3.52-3.42 (m, 1H), 3.20 (t, 2H), 2.27 (d, 2H), 1.91-1.77 (m, 2H).

Example 8910-Bromo-8-methyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-bromo-8-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(404 mg, 0.88 mmol) was dissolved in 1,4-dioxane (18 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 10.0 mL, 40.0mmol). The mixture was stirred at RT for 4 h. Concentration in vacuoafforded the title compound (360 mg, 95% of theory).

LC-MS (Method 1B): R_(t)=0.60 min, MS (ESIPos): m/z=361 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=6.87 (s, 1H), 6.62 (s, 1H), 6.25 (s, 1H),3.74-3.66 (m, 2H), 3.51-3.42 (m, 1H), 3.36-3.27 (m, 2H), 2.44-2.37 (m,2H), 2.18 (s, 3H), 2.03-1.91 (m, 2H).

Example 9010-Chloro-9-fluoro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-chloro-9-fluoro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(428 mg, 1.02 mmol) was dissolved in 1,4-dioxane (20 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 11.7 mL, 46.7mmol). The mixture was stirred at RT for 4 h. Concentration in vacuoafforded the title compound (378 mg, 91% of theory).

LC-MS (Method 1B): R_(t)=0.55 min, MS (ESIPos): m/z=321 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.23 (dd, 1H), 7.12 (dd, 1H), 6.38 (s, 1H),3.69 (d, 2H), 3.57-3.48 (m, 1H), 3.36-3.28 (m, 2H), 2.44 (d, 2H),2.05-1.94 (m, 2H).

Example 914-(Piperidin-4-yl)-10-(1H-1,2,4-triazol-1-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(1H-1,2,4-triazol-1-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(96 mg, 0.22 mmol) was dissolved in 1,4-dioxane (2.2 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 0.55 mL, 2.2 mmol).The mixture was stirred at RT for 16 h. The resulting solid was filteredand washed with 1,4-dioxane to afford the title compound (72 mg, 87% oftheory).

LC-MS (Method 1B): R_(t)=0.43 min, MS (ESIPos): m/z=336 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=9.07 (s, 1H), 8.24 (s, 1H), 7.35-7.26 (m, 2H),7.15 (d, 1H), 6.34 (s, 1H), 3.69 (d, 2H), 3.60-3.50 (m, 1H), 3.39-3.28(m, 2H), 2.43 (d, 2H), 2.05-1.91 (m, 2H).

Example 929-Fluoro-10-(2-fluorophenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[9-fluoro-10-(2-fluorophenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(42 mg, 0.09 mmol) was dissolved in 1,4-dioxane (1 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.0 mL, 4.0 mmol). Themixture was stirred at RT for 4 h. Concentration in vacuo afforded thetitle compound (36 mg, 86% of theory).

LC-MS (Method 1B): R_(t)=0.70 min, MS (ESIPos): m/z=381 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=7.63-7.52 (m, 2H), 7.37-7.29 (m, 3H), 7.27-7.20(m, 1H), 6.35 (s, 1H), 3.69-3.60 (m, 3H), 3.34-3.24 (m, 2H), 2.40-2.30(m, 2H), 1.98-1.86 (m, 2H).

Example 9310-(2-Ethoxyphenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(2-ethoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(150 mg, 0.31 mmol) was dissolved in 1,4-dioxane (6 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 3.5 mL, 14.1 mmol). Themixture was stirred at RT for 4 h.

Concentration in vacuo afforded the title compound (173 mg).

LC-MS (Method 1B): R_(t)=0.68 min, MS (ESIPos): m/z=389 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.07-8.76 (m, 1H), 7.60 (d, 1H), 7.51 (d,1H), 7.41 (dd, 1H), 7.33 (dd, 1H), 7.12 (d, 1H), 7.03 (dd, 1H), 6.90 (d,1H), 6.60 (br. s, 1H), 4.00 (q, 2H), 3.61-3.53 (m, 1H), 3.45 (d, 2H),3.29-3.12 (m, 2H), 2.36 (d, 2H), 2.04-1.87 (m, 2H), 0.78 (t, 3H)

Example 9410-(2-Isopropoxyphenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[10-(2-isopropoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(130 mg, 0.26 mmol) was dissolved in 1,4-dioxane (5 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 3.0 mL, 12.0 mmol). Themixture was stirred at RT for 4 h. Concentration in vacuo afforded thetitle compound (153 mg).

LC-MS (Method 1B): R_(t)=0.72 min, MS (ESIPos): m/z=403 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.07-8.80 (m, 1H), 7.59 (d, 1H), 7.49 (dd,1H), 7.39 (dd, 1H), 7.32 (dd, 1H), 7.11 (d, 1H), 7.02 (dd, 1H), 6.90 (d,1H), 6.55 (br. s, 1H), 4.55-4.46 (m, 1H), 3.57 (s, 1H), 3.45 (d, 2H),3.22 (m, 2H), 2.35 (d, 2H), 2.03-1.88 (m, 2H), 0.96 (d, 6H).

Example 9510-(2-Fluorophenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one

10-(2-fluorophenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride (100 mg, 0.23 mmol) was dissolved in hydrochloric acid(1.0 M in water) and treated with sodium hydroxide solution (1.0 M inwater). The precipitate was collected by filtration, washed with water,and dried under vacuo to afford the title compound (35 mg, 42% oftheory).

LC-MS (Method 1B): R_(t)=0.68 min, MS (ESIPos): m/z=363 [M+H]⁺

Example 964-(Piperidin-4-yl)-10-(1H-pyrazol-1-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(1H-pyrazol-1-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(380 mg, 0.87 mmol) was dissolved in 1,4-dioxane (14 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 5.0 mL, 20.0 mmol).The mixture was stirred at RT for 8 h. Concentration in vacuo andtrituration with acetonitrile afforded the title compound (338 mg).

¹H-NMR (500 MHz, D₂O): δ=7.67 (s, 1H), 7.24 (s, 1H), 6.67 (dd, 1H), 6.52(d, 1H), 6.28 (s, 1H), 6.20 (d, 1H), 5.94 (s, 1H), 3.68-3.59 (m, 2H),3.26-3.15 (m, 2H), 3.09-2.98 (m, 1H), 2.23-2.14 (m, 2H), 1.88-1.76 (m,2H).

Example 9710-(2-Fluoro-6-methoxyphenyl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl 4-[10-(2-fluoro-6-methoxyphenyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate (21 mg,0.043 mmol) was dissolved in 1,4-dioxane (0.6 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 0.2 mL, 0.8 mmol). Themixture was stirred at RT for 4 h. Concentration in vacuo afforded thetitle compound (18 mg, 96% of theory).

LC-MS (Method 1B): R_(t)=0.66 min, MS (ESIPos): m/z=393 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=8.46 (s, 1H), 7.73-7.66 (m, 1H), 7.66-7.52 (m,2H), 7.17-6.99 (m, 3H), 6.42 (s, 1H), 3.88-3.78 (m, 1H), 3.77-3.71 (m,3H), 3.70-3.61 (m, 2H), 3.40-3.27 (m, 2H), 2.56-2.43 (m, 2H), 2.09-1.94(m, 2H).

Example 984-(Piperidin-4-yl)-10-(2H-1,2,3-triazol-2-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(2H-1,2,3-triazol-2-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(750 mg, 1.71 mmol) was dissolved in 1,4-dioxane (25 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 8.0 mL, 32.0 mmol).The mixture was stirred at RT for 16 h. Concentration in vacuo affordedthe title compound (730 mg, 96% of theory).

LC-MS (Method 1B): R_(t)=0.58 min, MS (ESIPos): m/z=336 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=12.24 (br. s, 1H), 8.94 (br. s, 1H), 8.75(br. s, 1H), 8.45 (s, 2H), 7.80 (d, 1H), 7.66 (d, 1H), 7.55 (dd, 1H),6.38 (s, 1H), 3.84 (br. s., 1H), 3.44 (d, 2H), 3.19 (d, 2H), 2.32 (d,2H), 1.94 (d, 2H).

Example 994-(Piperidin-4-yl)-10-(1H-1,2,3-triazol-1-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-[2-oxo-10-(1H-1,2,3-triazol-1-yl)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(237 mg, 0.54 mmol) was dissolved in 1,4-dioxane (8 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.4 mL, 5.6 mmol). Themixture was stirred at 60° C. for 6 h. The precipitate was collected byfiltration and dried to afford the title compound (210 mg, 88% oftheory).

LC-MS (Method 1B): R_(t)=0.44 min, MS (ESIPos): m/z=336 [M+H-xHCl]⁺

¹H-NMR (500 MHz, D₂O): δ=8.39 (s, 1H), 7.88 (s, 1H), 7.12-7.05 (m, 2H),6.91-6.83 (m, 1H), 6.26 (s, 1H), 3.70 (d, 2H), 3.42 (t, 1H), 3.31 (t,2H), 2.40 (d, 2H), 2.04-1.92 (m, 2H).

Example 10010-Chloro-7-methyl-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

Tert-butyl4-(10-chloro-7-methyl-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)piperidine-1-carboxylate(230 mg, 0.55 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.4 mL, 5.6 mmol). Themixture was stirred at RT for 16 h. The precipitate was collected byfiltration, washed with dioxane, and dried to afford the title compound(194 mg, 90% of theory).

LC-MS (Method 1B): R_(t)=0.58 min, MS (ESIPos): m/z=317 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=9.01-8.71 (m, 1H), 7.21 (d, 1H), 7.01 (d,1H), 6.67 (br. s, 1H), 3.98-3.83 (m, 1H), 3.21 (d, 2H), 2.37 (d, 2H),1.98 (d, 2H).

Example 101

(+)-Cis-10-Chloro-4-(2-methylpiperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride [Enantiomerically Pure Cis-Isomer]

A suspension of (+)-cis-Tert-butyl4-(10-chloro-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl)-2-methylpiperidine-1-carboxylate[Enantiomerically Pure Cis-Isomer] (40 mg, 0.09 mmol) in methanol (0.053ml) was treated with HCl 4N in dioxane (0.35 ml). The reaction mixturewas stirred 1 h at rt. The mixture was evaporated and the crude wasstirred in dichloromethane, evaporated and dried under vacuo to yieldthe title compound (22 mg, 66% of theory).

LC-MS (Method 5B): RT=0.54 min, MS (ESIPos): m/z=317 [M+H-xHCl]⁺

[α]²⁰=+0.37 (c. 0.27, methanol) WL=589 nm

¹H-NMR (400 MHz, MeOD): δ 7.41 (d, 1H), 7.27 (t, 1H), 6.96 (d, 1H), 6.41(s, 1H), 4.08-3.98 (m, 1H), 3.83-3.74 (m, 1H), 3.57 (dm, 1H), 3.45-3.36(m, 1H), 3.30-3.24 (m, 1H), 2.39-2.31 (m, 1H), 2.21 (dd, 1H), 2.08-1.98(m, 1H), 1.47 (d, 3H).

Example 102[2-oxo-4-(piperidin-4-yl)-1,2-dihydropyrimido[1,2-b]indazol-10-yl]acetonitrilehydrochloride

Tert-butyl4-[10-(cyanomethyl)-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(12 mg, 0.03 mmol) was dissolved in methanol (0.08 mL) and then 4N HClin dioxane (0.07 mL) was added and the mixture was stirred at roomtemperature overnight. The resulting suspension was filtered and thesolid was washed with methanol and dried for 16 h in vacuo to give thetitle compound (5 mg, 53% of theory).

LC-MS (Method 3B): R_(t)=1.30 min, MS (ESIPos): m/z=307 [M+H-xHCl]⁺

¹H-NMR (400 MHz, D₂O): δ=7.32 (d, 1H), 7.24 (dd, 1H), 6.76 (d, 1H), 6.39(s, 1H), 3.98 (s, 2H), 3.60 (d, 2H), 3.51 (dd, 1H), 3.25 (dd, 2H), 2.35(d, 2H), 1.89 (dd, 2H)

Example 10310-(1H-imidazol-5-yl)-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

tert-butyl4-{2-oxo-10-[1-(tetrahydro-2H-pyran-2-yl)-1H-imidazol-5-yl]-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate(55 mg, 0.11 mmol) was dissolved in 1,4-dioxane (1.5 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 0.53 mL, 2.12mmol). The solvent was removed and the residue treated withacetonitrile. The resulting solid was filtered and washed withacetonitrile to afford the title compound (36.5 mg, 82% of theory).

LC-MS (Method 6B): R_(t)=0.90 min, MS (ESIPos): m/z=335 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=ppm 15.89 (br. s, 1 H), 9.09-9.39 (m, 3 H),8.65 (s, 1 H), 7.70-7.83 (m, 2 H), 7.60 (d, 1 H), 6.83 (s, 1 H),3.84-4.06 (m, 1 H), 3.44 (m, 2 H), 3.00-3.28 (m, 2 H), 2.30-2.41 (m, 2H), 1.99-2.15 (m, 2 H).

Example 1044-(piperidin-4-yl)-10-(1H-pyrrol-2-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

tert-butyl4-{10-[1-(tert-butoxycarbonyl)-1H-pyrrol-2-yl]-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate(140 mg, 0.26 mmol) was dissolved in 1,4-dioxane (2.5 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 1.3 mL, 5.2 mmol).The solvent was removed and the residue treated with acetonitrile. Theresulting solid was filtered and washed with acetonitrile to afford thetitle compound (79.4 mg, 74% of theory).

LC-MS (Method 5B): R_(t)=1.48 min, MS (ESIPos): m/z=334 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=ppm 13.39 (br. s., 1 H), 9.18 (br. s., 2H), 7.34-7.64 (m, 3 H), 7.15 (br. s., 1 H), 6.96 (br. s, 1 H), 6.82 (s,1 H), 6.24 (d, 1 H), 4.00 (t, 1 H), 3.45 (d, 2 H), 3.06-3.29 (m, 2 H),2.38 (d, 2 H), 1.88-2.13 (m, 2 H).

Example 10510-hydroxy-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrobromide

10-Methoxy-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride (Example 8) (25 mg, 0.08 mmol) was dissolved in aceticacid (2 mL) and treated with hydrobromic acid (58% in water, 0.5 mL, 9.2mmol). The mixture was heated to 125° C. for 16 h, then the solventswere removed and the resulting solid was dried in high vacuum to affordthe title compound (32.5 mg, quant.).

LC-MS (Method 7B): R_(t)=1.14 min, MS (ESIPos): m/z=285.1 [M+H-xHBr]⁺

¹H-NMR (400 MHz, D₂O-d₆): δ=ppm 6.89-7.04 (m, 1 H), 6.56 (d, 1 H), 6.02(s, 1 H), 5.93-5.99 (m, 1 H), 3.50-3.63 (m, 2 H), 3.19 (br. s., 3 H),2.20-2.31 (m, 2 H), 1.72-1.89 (m, 2 H).

Example 1062-oxo-4-(piperidin-4-yl)-1,2-dihydropyrimido[1,2-b]indazole-10-carboxylicacid hydrochloride

4-[1-(tert-butoxycarbonyl)piperidin-4-yl]-2-oxo-1,2-dihydropyrimido[1,2-b]indazole-10-carboxylicacid (185 mg, 0.45 mmol) was dissolved in 1,4-dioxane (2 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 2.2 mL, 9.0 mmol)for 18 h at rt. The resulting solid was filtered and washed withacetonitrile to afford the title compound (99.5 mg, 64% of theory).

LC-MS (Method 5B): R_(t)=0.33 min, MS (ESIPos): m/z=313.2 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=ppm 13.90-14.33 (br. s, 1 H), 11.84 (br.s., 1 H), 9.02 (br. s, 1 H), 8.85 (br. s, 1 H), 7.90 (d, 1 H), 7.81 (d,1 H), 7.52 (t, 1 H), 6.32 (s, 1 H), 3.73-3.87 (m, 1 H), 3.43 (m, 3 H),3.17 (m, 2 H), 2.30 (d, 2 H), 1.95 (m, 2 H).

Example 1074-(piperidin-4-yl)-10-(2,2,2-trifluoroethoxy)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

tert-butyl4-[2-oxo-10-(2,2,2-trifluoroethoxy)-1,2-dihydropyrimido[1,2-b]indazol-4-yl]piperidine-1-carboxylate(188 mg, 0.40 mmol) was dissolved in 1,4-dioxane (2.5 mL) and treatedwith hydrochloric acid (4 M solution in 1,4-dioxane, 1.3 mL, 5.2 mmol).The resulting solid was filtered and washed with acetonitrile to affordthe title compound (150 mg, 92% of theory).

LC-MS (Method 8B): R_(t)=0.71 min, MS (ESIPos): m/z=367 [M+H-xHCl]⁺

¹H-NMR (400 MHz, DMSO-d₆): δ=ppm (br. s, 2 H), 7.30-7.44 (m, 1 H), 7.21(d, 1 H), 6.61 (d, 1 H), 6.44 (br. s, 1 H), 4.98 (q, 2 H), 3.75-3.91 (m,1 H), 3.42 (d, 2 H), 3.16 (m, 2 H), 2.31 (d, 2 H), 1.98 (d, 2 H).

Example 108 10-amino-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-onehydrochloride

tert-butyl4-{10-[(tert-butoxycarbonyl)amino]-2-oxo-1,2-dihydropyrimido[1,2-b]indazol-4-yl}piperidine-1-carboxylate(80 mg, 0.17 mmol) was dissolved in 1,4-dioxane (2 mL) and treated withhydrochloric acid (4 M solution in 1,4-dioxane, 1.3 mL, 5.2 mmol) for 3d. The resulting solid was filtered and washed with 1,4-dioxane andacetonitrile to afford the title compound (46 mg, 78% of theory).

LC-MS (Method 7B): R_(t)=1.13 min, MS (ESIPos): m/z=384 [M+H-xHCl]+

¹H-NMR (400 MHz, DMSO-d₆): δ=ppm 9.12 (br. s., 2 H), 7.26 (br. s., 1 H),6.88-7.07 (m, 1 H), 6.53-6.69 (m, 1 H), 6.28-6.49 (m, 1 H), 3.73-3.97(m, 1 H), 3.43 (m, 2 H), 3.17 (m, 2 H), 2.32 (m, 2 H), 1.99 (m, 2 H).

X-ray Diffractometry:

Synthesis of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (Example66) maleate

Approximately 100 mg of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) were solved in hexafluoroisopropanol without any heating. Thissolution was added to a solution of an equimolar amount of maleic acidsolved in water. This solution was evaporated at room temperature andatmospheric pressure. The resulting solid was analyzed by x ray powderdiffraction and corresponds to10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its maleate.

Synthesis of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (Example66) acetate

Approximately 100 mg of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) were solved in hexafluoroisopropanol without any heating. Thissolution was added to a solution of an equimolar amount of acetic acidsolved in water. This solution was evaporated at room temperature andatmospheric pressure. The resulting solid was analyzed by x ray powderdiffraction and corresponds to10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its acetate.

Synthesis of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (Example66) sulfate

Approximately 100 mg of10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) were solved in hexafluoroisopropanol without any heating. Thissolution was added to a solution of an equimolar amount of sulfuric acidsolved in water. This solution was evaporated at room temperature andatmospheric pressure. The resulting solid was analyzed by x ray powderdiffraction and corresponds to10-Chloro-4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) in form of its sulfate.

Measurement Conditions of X-ray Diffractometry:

Transmission diffractometer PANalytical X Pert PRO with PIXcel counter(multichannel):

Source of raw data XRPD measurement Scan-Axis Gonio Starting position[°2Th.] 2.0066  End position [°2Th.] 37.9906  Material of anode CuWavelength K-Alpha1 [Å] 1.54060 Wavelength K-Alpha2 [Å] 1.54443K-A2/K-A1 ratio 0.50000 Generator 40 mA, 40 kV Primary monochromatorfocussing X-ray mirror Sample rotation yes

TABLE 1 X-ray diffractogram of the maleate, acetate, and sulfate of10-Chloro- 4-(piperidin-4-yl)pyrimido[1,2-b]indazol-2(1H)-one (example66) Peak List [°2 Theta] Maleate Acetate Sulfate 9.6 8.3 5.6 13.5 9.110.7 17.4 12.3 13.8 22.1 24.3 20.3 23.1 25.0 20.8 23.7 26.7 25.8 26.728.3 27.6

B. ASSESSMENT OF THE PHARMACOLOGICAL ACTIVITY

The following abbreviations are used:

-   Brij polyoxyethylene lauryl ether-   CaCl₂ calciumchloride-   CFT clot formation time-   CM5 carboxymethylated dextran biosensor chips-   CT clotting time-   DMSO dimethylsulfoxide-   EDC N-ethyl-N′-(3-dimethylaminopropyl)-carbodiimide hydrochloride-   FVIII factor eight-   HEPES hydroxyethyl-piperazineethanesulfonic acid-   HCl hydrochloric acid-   IC50 half-maximal inhibitory concentration-   K_(D) dissociation constant-   MCF maximum clot firmness-   ML maximum lysis-   NaCl sodium chloride-   NHS N-hydroxysuccinimide-   OD optical density-   PBS phosphate buffered saline-   P-20 hybond P20-   Rmax response at saturation-   RU response units-   SPR surface plasmon resonance-   TF tissue factor-   tPA tissue plasminogen activator-   v/v volume/volume

The pharmacological effect of the compounds of formula (I-A) or (I-B)according to the invention can be shown in the following assays:

B-1. Biacore Assay

Assay Description Surface Plasmon Resonance Plasminogen Inh.

Definitions

The term “surface plasmon resonance”, as used herein, refers to anoptical phenomenon that allows for the analysis of the reversibleassociations of biological molecules in real time within a biosensormatrix, for example using the Biacore® system (GE HealthcareBiosciences, Uppsala, Sweden). Biacore® uses the optical properties ofsurface plasmon resonance (SPR) to detect alterations in the refractiveindex of a buffer, which changes as molecules in solution interact withthe target immobilized on the surface. In brief, proteins are covalentlybound to the dextran matrix at a known concentration and a ligand forthe protein is injected through the dextran matrix. Near infrared light,directed onto the opposite side of the sensor chip surface is reflectedand also induces an evanescent wave in the gold film, which in turn,causes an intensity dip in the reflected light at a particular angleknown as the resonance angle. If the refractive index of the sensor chipsurface is altered (e.g. by compound binding to the protein bound to thesurface) a shift occurs in the resonance angle. This angle shift can bemeasured. These changes are displayed with respect to time along they-axis of a sensorgram, which depicts the association and dissociationof any biological reaction. For further descriptions see Jönsson U etal., 1993 Ann Biol Clin.; 51(1):19-26.; Johnsson B et al, Anal Biochem.1991; 198(2):268-77.; Day Y et al, Protein Science, 2002; 11, 1017-1025;Myskza D G, Anal Biochem., 2004; 329, 316-323

The term “K_(D)”, as used herein, is intended to refer to thedissociation constant of a particular compound/target protein complex.

Biological Activity

The biological activity (e.g. as inhibitors of plasminogen) of thecompounds of the invention can be measured using the assays set forth inthe examples below, for example the surface plasmon resonance (SPR)experiments described in Example 1. The level of activity exhibited by agiven compound in the SPR assay can be defined in terms of the K_(D)value.

Example 1

The ability of the compounds of the invention to bind human plasminogenprotein may be determined using surface plasmon resonance (SPR). K_(D)values may be measured using a Biacore® T200 or Biacore® 4000 instrument(GE Healthcare, Uppsala, Sweden).

Cloning, expression, and purification of recombinant human plasminogenkringle 1 domain protein is performed according to a protocol based onpublished methods (Menhart et al, Biochemistry, 1991, 30, 1948-1957)with modifications as follows: Briefly, an E. coli expression constructcoding for the amino acid sequenceMKYLLPTAAAGLLLLAAQPAMAHHHHHHHHHHMDYDIPTTENLYFQG followed by the humanplasminogen kringle 1 domain protein sequence amino acids 101 to 181(numbering based on Uniprot acc no P00747) and a stop codon issynthesized (GeneArt, Regensburg, Germany) and cloned into a modifiedpET22b vector (Novagen, Darmstadt, Germany), allowing for periplasmaticexpression in E. coli and immobilized metal ion affinity chromatographyemploying a deca-histidine tag. E. coli BL21DE3 cells (Novagen) aretransformed, grown and harvested and their periplasmatic fractionreleased using a buffer comprising 50 mM Tris pH 8 and 500 mM sucrose(modified from Menhart et al, Biochemistry, 1991, 30, 1948-1957). Theperiplasmatic fraction is then sequentially filtered using 8 μm, 3 μmand 1.2 μm cellulose nitrate filters (Sartorius Stedim, Göttingen,Germany) and the filtrate subjected to Ni-Sepharose HP chromatography(GE Healthcare) according to the manufacturer's instructions. Theresulting eluate is then subjected to a Desalting Hi Prep 26/10 column(GE Healthcare) equilibrated in buffer (100 mM sodium phosphate pH 8,300 mM NaCl) followed by a lysine sepharose 4B (GE Healthcare)chromatography step according to the manufacturer's instructions. Theresulting fractions of highly purified protein at concentrations ofapproximately 0.5 mg/ml are buffer exchanged against buffer (100 mMsodium phosphate pH 8, 300 mM NaCl) and stored at −80° C.

For SPR measurements, recombinant human plasminogen kringle 1 protein isimmobilized using standard amine coupling (Johnsson B et al, AnalBiochem. 1991 Nov. 1; 198(2):268-77). Briefly, carboxymethylated dextranbiosensor chips (CM5, GE Healthcare) are activated withN-ethyl-N′-(3-dimethylaminopropyl)-carbodiimide hydrochloride (EDC) andN-hydroxysuccinimide (NHS) according to the supplier's instructions.Purified recombinant human plasminogen kringle 1 protein is diluted in10 mM sodium acetate pH 4.5 into 10 μg/ml and injected on the activatedchip surface. Subsequently, 1 M ethanolamine-HCl (GE Healthcare) isinjected to block unreacted groups, resulting in approximately 400response units (RU) of immobilized protein. A reference surface isgenerated by treatment with NHS-EDC and ethanolamine-HCl. Compounds aredissolved in an aqueous 1% v/v acetic acid solution to a concentrationof 20 mM, followed by addition of 1 vol of 100% dimethylsulfoxide (DMSO,Sigma-Aldrich, Germany) resulting in a compound concentration of 10 mMand subsequently diluted in running buffer (PBS pH 7.4, 0.05% v/vSurfactant P-20 (GE Healthcare), 1% v/v DMSO). For affinitymeasurements, five-fold serial dilutions of compound (0.64 nM to 10 μM)are injected over immobilized protein. The resulting sensorgrams aredouble-referenced against the reference surface as well as against blankinjections. The double-referenced steady state responses are plottedagainst the test compound concentration and a fit using the equationResponse=Rmax*[compound]/([compound]+K_(D))+offset is generated.Parameters Rmax (response at saturation), K_(D) (dissociation constant)and the offset parameter are calculated using a nonlinear least squaresfit as implemented in the Biacore® evaluation software (GE Healthcare).

B-2. Plasma-based Clot Lysis Assay (5%)

The clot-lysis test system configures the kinetics of clot formation anddegradation in vitro and allows quantifying modulation of the process byselected test compounds.

The test compounds were dissolved in 1% acetic acid and furthercomplemented with an equal volume of DMSO. The resulting stock solutionswere serially diluted in 0.5% acetic acid/50% DMSO. 1 μL aliquots ofthese solutions were placed into 384 well microplates (Greiner, black,transparent bottom), followed by 30 μL of diluted human citrated plasma(platelet-poor, final concentration: 5%; supplemented with fibrinogen,final concentration: 3 μM; dilution buffer: 20 mM HEPES, 150 mM NaCl,0.01% Brij (pH 7)). The reactions were started by addition of 20 L ofCaCl₂ (final concentration: 10 mM), and tPA (tissue plasminogenactivator, final concentration: 0.2 nM) in dilution buffer, followed byan additional volume of 20 μL dilution buffer for improved mixing. Thereactions were incubated at 37° C. Clot formation and degradation wasmonitored spectrophotometrically by kinetic optical density measurementsat 405 nm. IC50 values were determined by comparing the resulting timecourses with the time course of a blank control reaction.

Results B-2.

Example IC50 (nM) Example IC50 (nM) Example IC50 (nM) 1 51 2 30 3 28 428 5 37 6 94 7 95 8 46 9 36 10 34 11 26 12 32 13 31 14 50 15 48 16 34 1722 18 38 19 26 20 22 21 30 22 26 23 28 24 34 25 21 26 29 27 13 28 33 2928 30 46 31 97 32 210 33 21 36 18 37 44 38 60 39 24 40 38 41 23 42 11043 100 44 48 45 37 46 17 47 24 48 36 49 36 50 14 51 15 52 13 53 10 54 1555 14 56 14 57 13 58 15 59 16 60 14 61 24 62 18 63 13 64 19 65 25 66 1567 13 68 25 69 20 70 35 71 15 72 14 73 23 74 15 75 16 76 15 77 11 78 1579 11 80 18 81 16 82 20 83 41 84 23 85 18 86 15 87 25 88 26 89 36 90 2491 27 92 27 93 28 94 35 95 18 96 26 97 30 98 27 99 29 100 30 101 35 103110 104 35 105 74 106 420 107 34 108 35B-3. Plasma-based Clot Lysis Assay (85%)

For induction of clot formation and subsequent clot lysis (fibrinolysis)a mixture of tissue factor (1 pM) and tissue plasminogen activator (tPA,0.04 μM) was added to human plasma (final concentration 85%). The testcompounds or saline controls were added simultaneously to TF and tPA.The functional activity is triggered with CaCl₂ (12.5 mM) and wasmonitored by measuring the optical density at 405 nM (OD₄₀₅).Fibrinolysis was evaluated as a relative decrease of OD after maximalclot formation. (Sperzel M, Huetter J, 2007, J Thromb Haemost 5(10):2113-2118).

B-4. Thrombelastometry

Whole blood Thrombelastometry measurements are performed to confirm thepotency of the compounds in inhibiting fibrinolysis and improvingfirmness of the clots (as seen in plasma based assays), for exampleusing the ROTEM® system (Tem International GmbH, Munich, Germany). TheROTEM® system is a diagnostic (viscoelastic) technique which providesinformation on hemostasis. It includes a four-channel instrument, acomputer, activators and disposable cups and pins. Kinetic changes inthe blood sample are detected optically (light reflection) and dataobtained from the reflected light is then processed into a graphicaloutput by an integrated computer. Characteristic curves and numericparemeters are generated. Thrombelastographic parameters of ROTEM®hemostatic systems include: Clotting Time (CT), which reflects thereaction time (the time required to obtain 2 mm amplitude following theinitiation of data collection) to initiate blood clotting; ClotFormation Time (CFT), provides information about the kinetics of clotformation; the alpha angle to reflect clotting propagation. Maximum ClotFirmess (MCF) is defined as maximum amplitude which reflects thefirmness of the clot (clot quality) and Maximum Lysis (ML) indicatesfibrinolysis. For induction of clot formation and subsequent clot lysisa mixture of tissue factor (TF) and tissue plasminogen activator (tPA)is added to 300 μL freshly drawn citrated whole blood. Blood frompatients with coagulation disorders and antibodies against coagulationfactors (e.g. to neutralize FVIII activity and render the bloodhemophilic) may be used. TF and tPA concentrations are adjusteddependent on the different conditions and species the whole blood isdrawn from. Data are collected for 2 hours using a computer-controlledROTEM® system.

For induction of clot formation and subsequent clot lysis in human wholeblood or human Factor VIII depleted whole blood, a mixture of tissuefactor (final concentration 0.5 pM) and tissue plasminogen activator(tPA, final concentration 10 nM) is added to 300 μL citrated human wholeblood. The test compounds or controls are added simultaneously to TF andtPA.

For induction of clot formation and subsequent clot lysis (fibrinolysis)in rat whole blood, a mixture of tissue factor (final concentration 1pM) and tissue plasminogen activator (tPA, final concentration 50 nM) isadded to 300 μL citrated rat whole blood. The test compounds or controlsare added simultaneously to TF and tPA. Or in the case of ex vivoexperiments the test compounds are dosed to the animal, blood is drawnat different time points after administration and added to the test cup.

For induction of clot formation and subsequent clot lysis (fibrinolysis)in hemophilia A dog plasma or whole blood, a mixture of tissue factor(TF) and tissue plasminogen activator (tPA) is added to 300 μL citratedhemophilia A whole blood or plasma. TF and tPA concentrations aretitrated and adjusted according to the current needs and technicalrequirements. Different concentrations of rFVIII are added to the testsystem in vitro (1-100%). The test compounds or controls are addedsimultaneously to TF and tPA. In the case of ex vivo experiments thetest compounds are dosed to the animal, blood is drawn at different timepoints after administration and added to the test cup.

B-5. In vivo Assays

To determine the protective effect of compounds on clot stability andblood loss in vivo, different bleeding models in different species areemployed. Animals may be anticoagulated with different anticoagulants toinduce a bleeding tendency. Genetically modified animals to mimick bloodcoagulation disorders may be used or antibodies to neutralize activityof different coagulation factors may be administered. Compounds of theinvention are administered orally or parenterally at various indicateddoses, at varying time courses prior to the injury. Injuries andendpoints may vary dependent on the mimicked disease condition.

B-5.1 Tail Bleeding in Hyperfibrinolytic Rats

In anaesthetized rats hyperfibrinolysis is induced by a continuousinfusion of tPA (8 mg/kg/h) for twenty-five minutes via the rightjugular vein. The right jugular vein is exposed and cannulated withsaline-filled polyethylene catheters. The catheter is connected to asyringe pump (Braun, Melsungen, Germany) for the infusion of tPA.Hemostatic efficacy is evaluated in a rat bleeding model, where 8mg/kg/h tPA is continuously infused to prolong bleeding time beyondcontrol values. Test compounds or vehicle are administered by oralgavage at different time points before induction of anesthesia orintravenously through a second catheter in the contralateral jugularvein starting ten minutes after initiating tPA infusion. All infusionsare stopped twenty-five minutes after onset of tPA administration.Twentyfive minutes after starting the tPA infusion, the rat tail isfully transsected 2 mm from the tip of the tail. The tail is submergedin 37° C. physiological saline and bleeding is observed for 30 minutes.The time of bleeding is defined as the interval between the initialtransection and the visual cessation of bleeding. A value of 30 minutesis assigned to those animals where bleeding does not stop during theentire observation period.

B-5.2 Tail Bleeding in Dabigatran-anticoagulated Rats

Animals are treated orally at different time points prior to inductionof bleeding. In anaesthetized, anticoagulated rats bleeding is inducedby a bolus and continuous infusion (jugular vein) of thethrombin-inhibitor Dabigatran (bolus 1 mg/kg followed by an infusion of0.3 mg/kg/ml/h) for 15 minutes. 15 minutes after Dabigatran infusion therat tail is fully transected 2 mm from the tip of the tail. Bleeding isobserved for 30 minutes after the tail is submerged in 37° C.physiological saline. Blood loss is evaluated visually in 30 secondintervals utilizing a scoring system (0=no blood flow; 1=weak, breakingto no blood flow; 2=reduced blood flow; 3=continuous blood flow;4=strong, continuous blood flow). Initial bleeding time until the firstvisual cessation of bleeding as well as cumulative bleeding time overthe entire observation period of 30 minutes is evaluated.

C. EXEMPLARY EMBODIMENTS OF PHARMACEUTICAL COMPOSITIONS

The compounds of formula (I-A) or (I-B) according to the invention canbe converted into pharmaceutical preparations in the following ways:

Tablet:

Composition:

100 mg of the compound according to the invention, 50 mg of lactose(monohydrate), 50 mg of maize starch (native), 10 mg ofpolyvinylpyrrolidone (PVP 25) (from BASF, Ludwigshafen, Germany) and 2mg of magnesium stearate.

Tablet weight 212 mg, diameter 8 mm, radius of curvature 12 mm.

Production:

The mixture of compound according to the invention, lactose and starchis granulated with a 5% strength solution (m/m) of the PVP in water. Thegranules are dried and then mixed with the magnesium stearate for 5minutes. This mixture is compressed in a conventional tablet press (seeabove for format of the tablet). A guideline compressive force for thecompression is 15 kN.

Suspension which can be Administered Orally:

Composition:

1000 mg of the compound according to the invention, 1000 mg of ethanol(96%), 400 mg of Rhodigel® (xanthan gum from FMC, Pennsylvania, USA) and99 g of water.

10 ml of oral suspension correspond to a single dose of 100 mg of thecompound according to the invention.

Production:

The Rhodigel is suspended in ethanol, and the compound according to theinvention is added to the suspension. The water is added while stirring.The mixture is stirred for about 6 h until the swelling of the Rhodigelis complete.

Solution which can be Administered Orally:

Composition:

500 mg of the compound according to the invention, 2.5 g of polysorbateand 97 g of polyethylene glycol 400. 20 g of oral solution correspond toa single dose of 100 mg of the compound according to the invention.

Production:

The compound according to the invention is suspended in the mixture ofpolyethylene glycol and polysorbate with stirring. The stirring processis continued until the compound according to the invention hascompletely dissolved.

I.V. Solution:

The compound according to the invention is dissolved in a concentrationbelow the saturation solubility in a physiologically tolerated solvent(e.g. isotonic saline, 5% glucose solution and/or 30% PEG 400 solution).The solution obtained is sterilized by filtration and used to fillsterile and pyrogen-free injection containers.

The invention claimed is:
 1. A method of treatment of bleeding in ahuman or animal, the method comprising administering an effective amountof a compound of a formula (I-A)

in which R¹ is selected from hydrogen and C₁-C₄ alkyl; X¹ is selectedfrom nitrogen and C—R²; X² is selected from nitrogen and C—R³; X³ isselected from nitrogen and C—R⁴; X⁴ is selected from nitrogen and C—R⁵;with a proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and R², R³, R⁴,and R⁵ are independently from each other selected from hydrogen halogen,C₁-C₄ alkyl, C₁-C₄ alkenyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, C₁-C₄haloalkoxy, cyano, amino, nitro, mono- or dialkylamino, hydroxy, thiol,carboxyl, C₃-C₇ cycloalkyl, 5 to 6 membered heteroaryl, the 5 to 6membered heteroaryl being optionally substituted with one, two, or threesubstituents selected from C₁-C₄ alkyl, and phenyl, the phenyl beingoptionally substituted with one, two, or three substituents selectedfrom halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, and C₁-C₄haloalkoxy, or a group of a formula selected from —CO—NR⁷R⁸, —NH—CO—R⁹,—CO—O—R⁹, —CO—R⁹, —SO₂R¹⁰, —SO₂NR¹¹R¹², —SR¹⁰, CH₂CN, —CH₂NR¹¹R¹²,—CH₂OR¹⁰, wherein R⁷ and R⁸ independently from each other representhydrogen, C₁-C₄ alkyl, C₆ aryl, and 5-6 membered heteroaryl; R⁹represents, C₁-C₄ alkyl, C₆ aryl, and 5-6 membered heteroaryl; R¹⁰represents C₁-C₄ alkyl; R¹¹ and R¹² independently from each otherrepresent hydrogen, and C₁-C₄ alkyl; with a proviso that zero, one, two,or three of R² to R⁵ are different from hydrogen, and salts thereof. 2.The method of claim 1, wherein in the compound of the formula (I-A): R¹is selected from hydrogen and C₁-C₄ alkyl; X¹ is selected from nitrogenand C—R²; X² is selected from nitrogen and C—R³; X³ is selected fromnitrogen and C—R⁴; X⁴ is selected from nitrogen and C—R⁵; with a provisothat 0, 1 or 2 of X¹ to X⁴ are nitrogen; and R², R³, R⁴, and R⁵ areindependently from each other selected from hydrogen, halogen, C₁-C₄alkyl, C₁-C₄ alkenyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, C₁-C₄ haloalkoxy,cyano, amino, nitro, mono- or dialkylamino, hydroxy, carboxyl, C₃-C₇cycloalkyl, 5 to 6 membered heteroaryl, the 5 to 6 membered heteroarylbeing optionally substituted with one, two, or three substituentsselected from C₁-C₄ alkyl, and phenyl, the phenyl being optionallysubstituted with one, two, or three substituents selected from halogen,C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, and C₁-C₄ haloalkoxy; with aproviso that zero, one, two, or three of R² to R⁵ are different fromhydrogen, and salts thereof.
 3. The method of claim 1, wherein in thecompound of the formula (I-A): R¹ is selected from hydrogen and methyl;X¹ is C—R² X² is C—R³ X³ is C—R⁴ X⁴ is C—R⁵; and R², R³, and R⁴, areindependently from each other selected from hydrogen and fluorine; R⁵ isselected from hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄alkoxy, C₁-C₄ haloalkoxy, cyano, amino, nitro, dialkylamino, hydroxy,carboxyl, C₃-C₇ cycloalkyl, triazolyl (bonded via N), thiazolyl,thienyl, pyridyl, imidazolyl, pyrrolyl, pyrazolyl (bonded via N or C),the pyrazolyl being optionally substituted with one or two substituentsselected from C₁-C₄ alkyl, and phenyl, the phenyl being optionallysubstituted with one or two substituents selected from halogen, C₁-C₄alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, and C₁-C₄ haloalkoxy; with aproviso that zero, one, or two of R² to R⁵ are different from hydrogen,and salts thereof.
 4. The method of claim 1, wherein in the compound ofthe formula (I-A): R¹ is hydrogen; X¹ is C—R²; X² is C—R³; X³ is C—R⁴;X⁴ is C—R⁵; R² to R⁴ are hydrogen; and R⁵ is chlorine; and saltsthereof.
 5. The method of claim 1, wherein the bleeding is associatedwith a disease or medical intervention selected from the groupconsisting of: menorrhagia, postpartum hemorrhage, hemorrhagic shock,trauma, surgery, otolaryngological surgery, dental surgery, urinarysurgery, prostatic surgery, gynaecological surgery, cardiovascularsurgery, and spinal surgery.
 6. The method of claim 1, wherein thebleeding is associated with a disease or medical intervention selectedfrom the group consisting of: liver or lung transplantation, stroke,liver diseases, hereditary angioedema, nosebleed, and synovitis andcartilage damage following hemarthrosis.
 7. A method of treatment ofbleeding in a human or animal, the method comprising administering aneffective amount of a compound of a formula (I-B)

in which R¹, X¹, X², X³, and X⁴ are as defined in claim 1, and saltsthereof; wherein x acid is a ratio of the compound to the acid which isfrom 1:10 to 10:1.
 8. The method of claim 7, wherein in the compound ofthe formula (I-B): R¹ is selected from hydrogen and C₁-C₄ alkyl; X¹ isselected from nitrogen and C—R²; X² is selected from nitrogen and C—R³;X³ is selected from nitrogen and C—R⁴; X⁴ is selected from nitrogen andC—R⁵; with a proviso that 0, 1 or 2 of X¹ to X⁴ are nitrogen; and R²,R³, R⁴, and R⁵ are independently from each other selected from hydrogen,halogen, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy,C₁-C₄ haloalkoxy, cyano, amino, nitro, mono- or dialkylamino, hydroxy,carboxyl, C₃-C₇ cycloalkyl, 5 to 6 membered heteroaryl, the 5 to 6membered heteroaryl being optionally substituted with one, two, or threesubstituents selected from C₁-C₄ alkyl, and phenyl, the phenyl beingoptionally substituted with one, two, or three substituents selectedfrom halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, and C₁-C₄haloalkoxy; with a proviso that zero, one, two, or three of R² to R⁵ aredifferent from hydrogen, and salts thereof.
 9. The method of claim 7,wherein in the compound of the formula (I-B): R¹ is selected fromhydrogen and methyl; X¹ is C—R²; X² is C—R³; X³ is C—R⁴; X⁴ is C—R⁵; andR², R³, and R⁴, are independently from each other selected from hydrogenand fluorine; R⁵ is selected from hydrogen, halogen, C₁-C₄ alkyl, C₁-C₄haloalkyl, C₁-C₄ alkoxy, C₁-C₄ haloalkoxy, cyano, amino, nitro,dialkylamino, hydroxy, carboxyl, C₃-C₇ cycloalkyl, triazolyl (bonded viaN), thiazolyl, thienyl, pyridyl, imidazolyl, pyrrolyl, pyrazolyl (bondedvia N or C), the pyrazolyl being optionally substituted with one or twosubstituents selected from C₁-C₄ alkyl, and phenyl, the phenyl beingoptionally substituted with one or two substituents selected fromhalogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkoxy, and C₁-C₄haloalkoxy; with a proviso that zero, one, or two of R² to R⁵ aredifferent from hydrogen, and salts thereof.
 10. The method of claim 7,wherein in the compound of the formula (I-B): R¹ is hydrogen; X¹ isC—R²; X² is C—R³; X³ is C—R⁴; X⁴ is C—R⁵; R² to R⁴ are hydrogen; and R⁵is chlorine; and salts thereof.
 11. The method of claim 7, wherein thebleeding is associated with a disease or medical intervention selectedfrom the group consisting of menorrhagia, postpartum hemorrhage,hemorrhagic shock, trauma, surgery, otolaryngological surgery, dentalsurgery, urinary surgery, prostatic surgery, gynaecological surgery,cardiovascular surgery, and spinal surgery.
 12. The method of claim 7,wherein the bleeding is associated with a disease or medicalintervention selected from the group consisting of: liver or lungtransplantation, stroke, liver diseases, hereditary angioedema,nosebleed, and synovitis and cartilage damage following hemarthrosis.